JP2004282272A - Ip address management method, ip address management program, and ip address management apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely and appropriately manage an IP address by shortening an IP address investigation time on a network. <P>SOLUTION: The IP address management apparatus 1 is provided with: an entry section 12 for entering an address investigation range; a plurality of investigation processing sections 20 for investigating an operating state of an IP address; an address investigation range split section 14 for splitting the address investigation range; a distribution section 18 for distributing an internal address investigation range by one range each; an investigation processing control section 19 for applying parallel execution control to the investigation of the operating state of IP addresses existing in the internal address investigation range; an internal address investigation time calculation section 22 for calculating a time required for the investigation by each internal address investigation range; and an internal address investigation range adjustment section 17 for adjusting a plurality of the internal address investigation ranges so that the calculated times are approximated to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an IP address management method, an IP address management program, and an IP address management device for managing an IP address in a network constructed by TCP / IP.
[0002]
[Prior art]
In a network constructed by TCP / IP, a predetermined IP address space is allocated to a company or the like, and within the company, information devices such as personal computers and printers of employees are respectively allocated within the IP space. An IP address has been assigned.
[0003]
The network administrator investigates whether the IP address in the IP address space is currently being used or is free, and if a new information device is to be connected, assigns a free IP address to the network. By connecting to, the usage status of the IP address is managed in a ledger.
[0004]
However, the IP address that has been used up to now may suddenly stop being used due to employee transfer or retirement, etc. Even though the IP address is used, the network administrator may manage it as being used. Therefore, it is necessary to periodically check the actual use status of the IP address.
[0005]
In addition, in some cases, the IP address may be used without permission even though the IP address is not used. If the investigation time becomes long as described above, the original normal Since the status is restored, the network administrator cannot identify the illegally used IP address, and regular investigation of the actual usage of the IP address is necessary to ensure security It is.
[0006]
Here, when the actual use status of the IP address is periodically checked, particularly, as the number of IP addresses in the assigned IP address space increases, the check requires much time. Therefore, the frequency of unauthorized use of the IP address increases. For this reason, an IP address management device that can easily acquire an IP address when a new information device is connected to a network is known (for example, see Patent Document 1).
[0007]
In Patent Literature 1, for IP addresses in a management range used on a network, the usage status of the IP addresses in the management range is searched. Then, the search result is stored in a file, and for IP addresses within the management range, the usage status of the IP addresses obtained by the search is displayed in a list on the screen of the display device.
[0008]
This search is performed, for example, at predetermined time intervals, and the time when the use of an unused IP address is started and the time when the used IP address is no longer used are stored in a file. That is, while the start IP address and the end IP address are designated and sequentially added, the existence check of the IP address on the network is checked by the ping command.
[0009]
[Patent Document 1]
JP-A-2002-223212
[0010]
[Problems to be solved by the invention]
However, in the above-described conventional IP address management device, the response check is executed one address at a time to check the use status of the IP address, and thus there is a problem that the check takes time. In particular, when investigating a huge IP address space, the conventional IP address management device takes a long time, for example, it takes more than 15 hours to investigate all 60,000 addresses. There was a problem.
[0011]
In addition, a plurality of conventional IP address management devices are introduced, but there are problems such as high cost and troublesome operation management. Further, as a feature of the IP address space, there is a variation because there are an area where IP addresses are intensively allocated and an area where IP addresses are not allocated at all in the same address space. Therefore, even in the case of simply dividing and conducting an investigation, the time required for each of the investigations also varies, and it was not possible to significantly reduce the investigation time by simply dividing the survey.
[0012]
In general, there is also a variation in survey time between daytime and nighttime. In other words, during the daytime, there are many active information devices, so there is little chance that a timeout occurs in the response inspection by the ping command, but in the nighttime time, there is almost no active information device, A timeout occurred in response inspection by most ping commands.
[0013]
That is, it takes time for one response test by the ping command for an information device that is not operating, and therefore, when the number of information devices that are not operating increases, the investigation time as a whole also increases. For this reason, in the conventional IP address management device, even when the survey is performed during the nighttime, the survey may be shifted to the daytime during the following day. In some cases, the survey was delayed.
[0014]
Furthermore, if the investigation time is long, the usage status of the IP address changes during the investigation, for example, illegal use of a vacant IP address, non-use of the IP address due to temporary disconnection from the network, vacant IP for information equipment. Address assignment may occur. Therefore, the content of the investigation of the usage status of the IP address obtained by the long-term investigation may be different from the actual usage status of the IP address after the completion of the investigation, and there is a problem in management of the IP address.
[0015]
That is, for an information device such as a portable information device that is used by disconnecting from the network, there is no response even if a response test is performed by using the ping command for the address. The IP address is determined to be a free IP address, and the conventional IP address management device has a problem in address management.
[0016]
Also, an information device using an IP address improperly may be already disconnected from the network at that time because there is no response even if a response check using the ping command is executed for the information device. Therefore, it is difficult to catch the illegal use of the IP address, and the conventional IP address management device has a security problem.
[0017]
As described above, if the investigation of the night time zone is shifted to the daytime zone, in the investigation of the daytime zone, the temporary non-use of the IP address and the illegal Could not be grasped, and there was a problem in IP address management.
[0018]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems caused by the prior art, so that an IP address management method, an IP address management program, and an IP address management method capable of shortening a time required to search an IP address on a network and performing safe and appropriate management can be achieved. An object of the present invention is to provide an address management device.
[0019]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, an IP address management method and an IP address management program according to the present invention provide a method of determining a predetermined address search range to be checked out of an IP address space including a plurality of IP addresses. And divides the address search range input in the address search range input step into a plurality of internal address search ranges, and outputs the IPs present in the plurality of internal address search ranges divided in the address search range division step. Investigation of the use state of the address is performed in parallel for each of the plurality of internal address investigation ranges, and the time required for the investigation for each of the plurality of internal address investigation ranges investigated in the first internal address investigation step is calculated. And each time calculated in the first internal address check time calculation step. So as to approximate to each other, and performs adjustment of a plurality of internal addresses Scope each other, which is investigated by the first internal address investigation process.
[0020]
In addition, a check on the use state of the IP addresses existing in the plurality of internal address check ranges adjusted in the first internal address check range adjustment step is performed in parallel for each of the adjusted plurality of internal address check ranges. Calculating the time required for the investigation for each of the plurality of internal address investigation ranges investigated in the second internal address investigation step, and calculating the respective times calculated in the second internal address investigation time calculation step to each other; As described above, the plurality of internal address check ranges checked in the second internal address check step may be adjusted.
[0021]
Further, a time required for each of the plurality of internal address search ranges adjusted in the first internal address check range adjusting step is calculated, and each time calculated in the third internal address check time calculating step is calculated. The plurality of internal address check ranges adjusted in the first internal address check range adjusting step may be adjusted so as to approximate each other.
[0022]
Further, the IP address management device according to the present invention comprises: an address search range input means for inputting a predetermined address search range to be checked out of an IP address space including a plurality of IP addresses; A plurality of internal address checking means for checking the address, and an address which divides the address checking range input by the address checking range input means into a plurality of internal address checking ranges equal to or less than the number of the internal address checking means. Inspection range dividing means, and among the plurality of internal address checking means, the internal address checking ranges divided by the address checking range dividing means are respectively assigned to the same number of internal address checking means as the number of divisions of the internal address checking range. Sorting means for sorting by one range; and Investigation processing for controlling each of the internal address investigation means to which the allocated internal address investigation range has been allocated to execute in parallel the investigation on the use state of the IP address existing in the allocated internal address investigation range. The control means, the internal address search time calculating means for calculating the time required for the search for each of the internal address search ranges allocated by the allocation means, and the respective times calculated by the internal address search time calculating means being close to each other. And an internal address search range adjusting means for adjusting the plurality of internal address search ranges.
[0023]
According to the present invention, in the IP address space, it is possible to reduce the variation in the time required for the search in each internal address check range in which the use state of the IP address is checked. Further, each time the usage status of the IP address is checked, the time required for the current check can be made smaller than the time required for the previous check. Further, by continuously adjusting the internal address check range by one check, the time variance calculated after the current adjustment can be made smaller than the time variance calculated after the previous adjustment.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of an IP address management method, an IP address management program, and an IP address management device according to the present invention will be described in detail below with reference to the accompanying drawings.
[0025]
(Embodiment 1)
FIG. 1 is an explanatory diagram of a configuration in which an IP address management device and an information device according to a first embodiment of the present invention are connected to a network. First, as shown in FIG. 1, the IP address management device 1 is connected to a network 2 such as a LAN, a WAN, and the Internet. The network 2 is connected to information devices 3 such as a personal computer terminal and a printer which are managed by the IP address management device 1. An IP address is assigned to each of the information devices 3 connected to the network 2.
[0026]
(Hardware configuration of IP address management device)
Next, a hardware configuration of the IP address management device 1 according to the present embodiment will be described. FIG. 2 is a block diagram illustrating a hardware configuration of the IP address management device 1.
[0027]
The IP address management device 1 includes a CPU 101, a ROM 102, a RAM 103, an HDD (hard disk drive) 104, an HD (hard disk) 105, an FDD (flexible disk drive) 106, and an FD (flexible disk drive) as an example of a removable recording medium. A disk (disc) 107, a display 108, an I / F (interface) 109, a keyboard 110, and a mouse 111 are provided. The components are connected by a bus 100.
[0028]
Here, the CPU 101 controls the entire operation of the IP address management device 1. The ROM 102 stores programs such as a boot program. The RAM 103 is used as a work area of the CPU 101. The HDD 104 controls reading / writing of data from / to the HD 105 under the control of the CPU 101. The HD 105 stores data written under the control of the HDD 104.
[0029]
The FDD 106 controls reading / writing of data from / to the FD 107 under the control of the CPU 101. The FD 107 stores the data written under the control of the FDD 106 and causes the IP address management device 1 to read the data stored in the FD 107. In addition to the FD 107, the removable recording medium may be a CD-ROM (CD-R, CD-RW), MO, DVD (Digital Versatile Disk), memory card, or the like. The display 108 displays a cursor, an icon, a tool box, and data such as a document, an image, and function information. As the display 108, for example, a CRT, a TFT liquid crystal display, a plasma display, or the like can be employed.
[0030]
The I / F 109 is connected to the network 2 through a communication line, and is connected to the information device 3 through the network 2. The I / F 109 controls an interface between the network 2 and the inside, and controls input / output of data from / to the information device 3. As the I / F 109, for example, a modem, a LAN adapter, or the like can be employed.
[0031]
The keyboard 110 includes keys for inputting characters, numerals, various instructions, and the like, and performs data input. Further, it may be a touch panel type input pad or a numeric keypad. The mouse 111 is used to move the cursor, select a range, or move and change the size of windows. A trackball, a joystick, or the like may be used as long as the pointing device has the same function.
[0032]
(Functional configuration of IP address management device)
Next, a functional configuration of the IP address management device 1 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a functional configuration of the IP address management device 1. The IP address management device 1 includes an address check table 10, an internal address check table 11, an input unit 12, a check start time monitoring unit 13, an address check range dividing unit 14, an address check table processing unit 15, It comprises a status change unit 16, an internal address investigation range adjustment unit 17, a distribution unit 18, an investigation processing control unit 19, and a plurality of investigation processing units 20.
[0033]
As shown in FIG. 4, the address check table 10 stores a record by an ID item 31, a check start IP address item 32, a check end IP address item 33, an address check number item 34, and a registration date item 35. Constitute. In the address check table 10, one ID is assigned to one address check range (start IP address to end IP address). The function of the address check table 10 is specifically realized by, for example, the RAM 103, the HD 105, or the FD 107 illustrated in FIG.
[0034]
As shown in FIG. 5, the internal address investigation table 11 includes an ID item 41, a division ID item 42, a top IP address item 43, a last IP address item 44, an internal address investigation number item 45, a status The item 46 and the internal address check time item 47 constitute a record. In the internal address investigation table 11, one ID is assigned to one address investigation range (investigation start IP address to investigation end IP address) shown in FIG. In addition, independent division IDs 10001 to 100005 are assigned to the respective detail lines. Specifically, the function of the internal address check table 11 is realized by, for example, the RAM 103, the HD 105, or the FD 107 illustrated in FIG.
[0035]
The input unit 12 receives data input from an input device such as the keyboard 110 shown in FIG. 2, for example, a survey start IP address and a survey end IP address indicating an address survey range to be investigated, the number of uses of the survey processing unit 20, And the survey start time. Specifically, the function of the input unit 12 is realized by, for example, the I / F 109 shown in FIG.
[0036]
The address check table processing unit 15 calculates the number of address checks based on the check start IP address and the check end IP address input to the input unit 12. Further, the investigation start IP address, the investigation end IP address, the number of address investigations, and the input date are registered in the address investigation table 10. The address check table processing unit 15 is specifically executed by the CPU 101 executing a program stored in the ROM 102, the RAM 103, the HD 105, the FD 107 or the like shown in FIG. 2, and by the I / F 109 shown in FIG. Implement that function.
[0037]
The survey start time monitoring unit 13 holds the survey start time input to the input unit 12. Then, when the investigation start time comes, a status change command is output to the status change unit 16. Note that the survey start time monitoring unit 13 is executed by the CPU 101 executing a program stored in the ROM 102, the RAM 103, the HD 105, the FD 107, or the like illustrated in FIG. The function is realized by F109.
[0038]
The address check range dividing unit 14 converts the input address check range into a plurality of internal address check ranges equal to or less than the number of the check processing units 20 based on the input use number of the check processing unit 20. To divide. Here, it is preferable to divide the number of IP addresses (the number of internal addresses investigated) within each internal address investigation range substantially equally.
[0039]
Further, the address search range dividing unit 14 registers the start IP address, the end IP address, and the number of internal address checks for each internal address check range in the internal address check table 11. It should be noted that the address search range dividing unit 14 is specifically configured such that the CPU 101 executes a program stored in the ROM 102, the RAM 103, the HD 105, the FD 107, or the like illustrated in FIG. The function is realized by F109.
[0040]
The distribution unit 18 extracts, from the internal address investigation table 11, all the divided internal address investigation ranges or the internal address investigation ranges adjusted by the internal address investigation range adjustment unit 17, which will be described later. Distribute to. Note that, specifically, the distribution unit 18 is executed by the CPU 101 executing a program stored in the ROM 102, the RAM 103, the HD 105, the FD 107, or the like illustrated in FIG. 2, and by the I / F 109 illustrated in FIG. Implement the function.
[0041]
The investigation processing control unit 19 performs, in parallel with each of the investigation processing units 20 to which the internal address investigation range has been allocated by the distribution unit 18, an investigation on the use state of the IP addresses existing in the distributed internal address investigation range. Control to run. That is, the investigation processing control unit 19 starts the investigation by each investigation processing unit 20 at the same time after the internal address investigation range is distributed by the distribution unit 18. Note that, specifically, the investigation processing control unit 19 executes the programs stored in, for example, the ROM 102, the RAM 103, the HD 105, and the FD 107 shown in FIG. 2 by the CPU 101 to execute the I / F 109 shown in FIG. Realizes that function.
[0042]
The plurality of investigation processing units 20 investigate the usage status of the IP address. Each check processing unit 20 includes a ping command execution unit 21 and an internal address check time calculation unit 22. The ping command execution unit 21 transmits an echo request via the network 2 to the information device 3 to which an IP address existing within the allocated internal address search range is allocated, and responds to the information device 3 (echo reply). ) To receive.
[0043]
Further, the ping command execution unit 21 measures the execution time from the transmission of the echo request to the reception of the echo reply. If an echo reply is not received within a predetermined time, a timeout occurs, and the execution time from the transmission of the echo request to the timeout is measured. The internal address investigation time calculation unit 22 accumulates the execution time measured for each IP address and calculates the time required for the investigation (hereinafter referred to as “internal address investigation time”).
[0044]
More specifically, the plurality of investigation processing units 20 are executed by the CPU 101 executing programs stored in, for example, the ROM 102, the RAM 103, the HD 105, and the FD 107 illustrated in FIG. The function is realized by F109.
[0045]
The status change unit 16 sends the status item 46 (see FIG. 5) of the detail line in the internal address investigation table 11 from the investigation start time monitoring unit 13, the address investigation range division unit 14, the distribution unit 18 or the internal address investigation time calculation unit 22. When a change command is received, the status item 46 is changed. Note that the status change unit 16 is specifically executed by the CPU 101 executing a program stored in, for example, the ROM 102, the RAM 103, the HD 105, and the FD 107 shown in FIG. 2, and by the I / F 109 shown in FIG. Implement that function.
[0046]
The internal address search range adjustment unit 17 reads a plurality of divided internal address search ranges from the internal address search table 11 and adjusts the plurality of internal address search ranges so that each address search time is close to each other. . The internal address check range adjustment unit 17 is, specifically, executed by the CPU 101 executing a program stored in, for example, the ROM 102, the RAM 103, the HD 105, and the FD 107 illustrated in FIG. 2, and the I / F 109 illustrated in FIG. Realizes that function.
[0047]
(Division registration processing procedure of IP address management device)
Next, a division processing procedure of the IP address management device 1 according to the present embodiment will be described with reference to the flowchart of FIG. First, it is determined whether or not a search start IP address and a search end IP address within the search range have been input in an IP address space including a plurality of continuous IP addresses (step S101).
[0048]
As shown in the registration screen of FIG. 7, when the survey start IP address and the survey end IP address are input (step S101: Yes), the number of address surveys is calculated (step S102). The number of address surveys is the number of addresses from the survey start IP address to the survey end IP address. Then, as shown in FIG. 4, the survey start IP address, the survey end IP address, the number of address surveys, and the date are registered in the address survey table 10 (step S103).
[0049]
Then, when the number of investigation processing copies is input (step S104: Yes), the number of internal address investigations is calculated (step S105). The number of internal address checks is calculated by the following equation (1). Here, the decimal part is rounded up.
[0050]
Number of internal address surveys = number of address surveys / number of survey processing copies input ... (1)
[0051]
Next, the start IP address and the end IP address of each internal address check range divided for each check processing unit 20 are calculated (step S106). In this calculation process, the start IP address and the end IP address of the internal address search range are calculated by adding the number of internal address checks from the start IP address of the address search range.
[0052]
Then, as shown in FIG. 5, the head IP address, the tail IP address, and the number of internal address checks for each check processing unit 20 are registered in the internal address check table 11 (step S107). Thereafter, as shown in FIG. 5, the status items 46 of all the detail lines of the internal address investigation table 11 are set to "adjusted" (step S108).
[0053]
(Survey processing procedure and adjustment processing procedure of the IP address management device 1)
Next, the investigation processing procedure and the adjustment processing procedure of the IP address management device 1 will be described with reference to the flowchart of FIG. First, as shown in FIG. 8, before the investigation start time has elapsed, the status items 46 of all the detail lines of the internal address investigation table 11 are maintained at “adjusted” (Step S201: No). When the investigation start time comes (step S201: Yes), the status items 46 of all the detail lines registered in the internal address investigation table 11 are changed from "adjusted" to "investigation wait" (step S202).
[0054]
Here, the investigation processing control unit 19 monitors whether or not the status items 46 of all the detail lines registered in the internal address investigation table 11 are changed to “waiting for investigation” (step S301). When the status item 46 of all the detail lines registered in the address investigation table 11 is changed to “waiting for investigation” (step S301: Yes), the status item of all the detail lines registered in the internal address investigation table 11 46 is changed from "waiting for investigation" to "under investigation" (step S302). Then, an internal address check process is executed (step S303). This internal address checking process will be described later.
[0055]
When the internal address investigation processing (Step S303) is completed, as shown in FIG. 9, all the status items 46 registered in the internal address investigation table 11 are changed from "Under investigation" to "Complete" (Step S304). ). Then, as shown in FIG. 9, the address check time of each check processing unit 20 calculated in the internal address check processing is stored in the internal address check time item 47 of each detail line in the internal address check table 11 (step S305). . Thereafter, it is monitored whether or not the status items 46 of all the detail lines registered in the internal address investigation table 11 are "waiting for investigation" (step S301).
[0056]
In the adjustment process, if the status items 46 of all the detail lines registered in the internal address investigation table 11 are changed to “completed” (step S203: Yes), the internal address investigation range adjustment process is executed (step S203). S204). This internal address search range adjustment processing will be described later. When the internal address investigation range adjustment processing (step S204) ends, the status item 46 of each detail line in the internal address investigation table 11 is changed to “adjusted” (step S205). Thereafter, the survey start time monitoring unit 13 sets the next survey start time (Step S206). When the investigation start time is newly set, monitoring of the investigation start time is executed based on the investigation start time (step S201).
[0057]
(Internal address investigation range adjustment processing procedure)
Next, the internal address check range adjustment processing (step S204) will be described with reference to the flowchart in FIG. First, n = 1 is set (step S210), and the average number of internal address checks between the item [n], which is the n-th item line, and the item [n + 1], which is the (n + 1) -th item line, in the internal address check table 11 is calculated. It is calculated (step S211). The average number of internal address checks is defined as the average number of internal address checks per unit time (for example, one second) and is calculated by the following equation (2). Here, the decimal part is rounded up.
[0058]
Average number of internal address investigations = (number of internal address investigations of item [n] + number of internal address investigations of item [n + 1]) / (internal address inspection time of item [n] + internal address inspection time of item [n + 1])・ ・ (2)
[0059]
Further, the average internal address check time of the item [n] and the item [n + 1] in the internal address check table 11 is calculated (step S212). The average internal address check time is calculated by the following equation (3).
[0060]
Average internal address check time = (internal address check time of item [n] + internal address check time of item [n + 1]) / 2 (3)
[0061]
Next, the number of address moves is calculated (step S213). The number of address moves refers to the number of addresses to move the end IP address of the item [n] and the start IP address of the item [n + 1] in the internal address examination table 11. This number of address moves is calculated by the following equation (4).
[0062]
Number of address moves = (average internal address check time−internal address check time of specification [n]) × average internal address check number (4)
[0063]
Then, the end IP address, the number of internal address checks, and the internal address check time of the item [n] after the number of address transfers have been calculated are calculated and stored in the database (not shown) and the internal address check table 11 (step S214). The tail IP address of the item [n] after moving by the number of address moves is calculated by the following equation (5).
[0064]
End IP address of item [n] after transfer = end IP address of item [n] before transfer + number of addresses moved (5)
[0065]
The number of internal address checks after moving by the number of address moves is calculated by the following equation (6).
[0066]
Number of internal address checks of item [n] after transfer = number of internal addresses check of item [n] before transfer + number of address transfers (6)
[0067]
Further, the internal address check time after moving by the number of address moves is calculated by the following equation (7).
[0068]
Internal address check time of item [n] after movement = Average internal address check time (7)
[0069]
Next, the head IP address, the number of internal address checks, and the internal address check time of the item [n + 1] after moving by the number of address moves are calculated and stored in a database (not shown) (step S215). The last IP address of the description [n + 1] after moving by the number of address movements stored in the database (not shown) is calculated by the following equation (8).
[0070]
The head IP address of the description [n + 1] after the movement = the head IP address of the description [n + 1] before the movement + the number of moved addresses (8)
[0071]
The number of internal address checks after moving by the number of address moves is calculated by the following equation (9).
[0072]
The number of internal address checks in the item [n + 1] after the transfer = the number of internal address checks in the item [n + 1] before the transfer-the number of address transfers (9)
[0073]
Further, the internal address check time after moving by the number of address moves is calculated by the following equation (10).
[0074]
Internal address check time of item [n + 1] after movement = average internal address check time (10)
[0075]
Next, n is counted up (step S216), and it is determined whether or not n is equal to the number of investigation processing copies (step S217). If they do not match (step S217: No), the process moves to step S211. If they match (step S217: Yes), the top IP address, the number of internal address checks, and the internal address check time of the item [n + 1] calculated in step S215 and stored in the DB are stored in the internal address check table 11 (step S217). S218). Thereafter, an error associated with the round-up processing in steps S211 to S213 is adjusted (step S219). This error adjustment is calculated from the head IP address and the tail IP address of the last detail line. Then, control goes to a step S205.
[0076]
The internal address search time in the internal address search range of the item [n] and the item [n + 1] are obtained by the end IP address of the item [n] and the head IP address of the item [n + 1] set by the adjustment processing. ] Are averaged to the same check time, that is, the average internal address check time of the item [n] and the item [n + 1]. By performing this leveling on two consecutive detailed lines, the internal address check times in all the detailed lines can be approximated to each other, and the address check time can be shortened as a whole.
[0077]
(Internal address check processing procedure)
Next, the internal address checking process (step S303) will be described with reference to FIG. After step S302, m = 1 is set (step S310). Then, the ping command execution unit 21 of each investigation processing unit 20 to which the internal address investigation range has been allocated is transmitted via the network 2 to the information device 3 to which the head IP address of the internal address investigation range is assigned. A request is transmitted (step S311). Then, when the echo reply is received from the information device 3 to which the echo request is transmitted (step S312: Yes), the execution time from the transmission of the echo request to the reception of the echo reply is calculated (step S313).
[0078]
On the other hand, when the echo reply has not been received (step S312: No), the reception of the echo reply is accepted until a preset timeout occurs (step S314: No). If the timeout has occurred (step S314: Yes), the execution time from the transmission of the echo request to the timeout is calculated (step S313). Then, m is counted up (step S315).
[0079]
If m after counting up matches the internal address check number (step S316: Yes), the internal address check time is calculated by integrating the execution times calculated so far (step S317). If m after the count-up has not reached the internal address check number (step S316: No), an echo request is transmitted to the next IP address (step S311).
[0080]
According to the conventional IP address management, the investigation process is performed without dividing the address investigation range. Therefore, when investigating the IP address in the address investigation range shown in FIG. 4, 73962 seconds (addition of the investigation time in FIG. 9) This requires about 20 hours and 30 minutes).
[0081]
On the other hand, according to the IP address management device 1 of the present embodiment, since the address search range is divided into a plurality and the search processing units 20 simultaneously start the search processing, as shown in FIG. The investigation time is 25863 seconds (about 7 hours) of the division ID "100004" at the longest. Therefore, the address check time can be significantly reduced.
[0082]
Thus, even when the portable information device 3 is used while being disconnected from the network 2 as in the case of the portable information device 3, it is possible to minimize the erroneous determination that the IP address is determined to be a free IP address, and to achieve high accuracy. Address management can be performed. In addition, even for the information equipment 3 that uses the IP address illegally, the illegal use can be captured, and highly secure IP address management can be performed.
[0083]
In addition, the internal IP address range adjustment process of step S204 adjusts the start IP address, the end IP address, and the internal address number of each divided ID after the adjustment, resulting in the result shown in FIG. In the investigation process based on the number of internal address investigations, the internal address investigation time is reduced from 25863 seconds (approximately 7 hours) of the previous investigation to 20668 seconds (approximately 6 hours) of the division ID “100003” at the longest. Therefore, the internal address checking time can be reduced by repeatedly performing the checking process.
[0084]
(Embodiment 2)
Next, a second embodiment of the IP address management device 1 of the present invention will be described. In this embodiment, a target level ratio as a target value and a level ratio as an adjustment result by the internal address search range adjustment unit 17 are introduced into the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0085]
First, as shown in FIG. 13, the address investigation table 10 includes an ID item 31, an investigation start IP address item 32, an investigation end IP address item 33, an address investigation number item 34, a registration date item 35, and a target leveling ratio item. 36. Here, the target level ratio is a target value of the level ratio.
[0086]
(Functional configuration of IP address management device)
Next, a functional configuration of the IP address management device 1 will be described with reference to FIG. FIG. 14 is a block diagram illustrating a functional configuration of the IP address management device 1.
[0087]
The adjustment result calculation unit 23 calculates a check result based on the maximum internal address check time among a plurality of internal address check times stored in the internal address check table and adjusted by the internal address check range adjustment unit 17. As a result of this check, for example, a ratio (that is, a level ratio) between the maximum address check time and the minimum address check time among the plurality of internal address check times is calculated. This leveling ratio can be expressed by the following equation (11).
[0088]
Normalization ratio = maximum internal address investigation time / minimum internal address investigation time (11)
[0089]
It should be noted that the adjustment result calculation unit 23 is, specifically, executed by the CPU 101 executing a program stored in, for example, the ROM 102, the RAM 103, the HD 105, the FD 107 shown in FIG. 2, and the I / F 109 shown in FIG. Realizes that function.
[0090]
The target reach determination unit 24 sets the target level ratio input from the input unit 12. In addition, the target arrival determination unit 24 and the target arrival determination unit 24 determine whether the level ratio has reached the target level ratio. It should be noted that the target arrival determination unit 24 is executed by the CPU 101 executing a program stored in, for example, the ROM 102, the RAM 103, the HD 105, or the FD 107 shown in FIG. 2, and the I / F 109 shown in FIG. Realizes that function.
[0091]
(Division processing procedure of IP address management device)
Next, the division processing procedure of the IP address management device 1 according to the present embodiment will be described with reference to the flowchart of FIG. First, it is determined whether an investigation start IP address and an investigation end IP address which are investigation ranges are input in an IP address space composed of a plurality of continuous IP addresses (step S101). As shown in the registration screen of FIG. 16, when the survey start IP address and the survey end IP address are input (step S101: Yes), the number of address surveys is calculated (step S102). The number of address checks is the number of addresses from the first IP address to the last IP address. The number of internal address checks is calculated by the above equation (1).
[0092]
Next, it is determined whether or not the target leveling ratio has been input (step S109). When the target leveling ratio has been input (step S109: Yes), as shown in FIG. 13, the research start IP address, the research end IP address, the number of address researches, the target leveling ratio, and the date are registered in the address research table 10. (Step S110).
[0093]
Then, when the number of investigation processing copies is input (step S104: Yes), the number of internal address investigations is calculated (step S105). Next, the start IP address and the end IP address of each internal address check range divided for each check processing unit 20 are calculated (step S106). In this calculation process, the start IP address and the end IP address of the internal address search range are calculated by adding the number of internal address checks from the start IP address of the address search range.
[0094]
Then, as shown in FIG. 5, the head IP address, the tail IP address, and the number of internal address checks for each check processing unit 20 are registered in the internal address check table 11 (step S107). Thereafter, as shown in FIG. 5, the status items 46 of all the detail lines of the internal address investigation table 11 are set to "adjusted" (step S108).
[0095]
(Procedure for adjusting the internal address search range of the IP address management device)
Next, the internal address search range adjustment processing procedure (step S204) of the IP address management device 1 will be described with reference to the flowchart in FIG. Note that the inspection processing procedure and the adjustment processing procedure of the IP address management device 1 and the internal address inspection processing procedure are the same as those in the first embodiment, and therefore will not be described.
[0096]
First, when the status items 46 of all the detail lines are completed (Step S203: Yes), the average ratio is calculated (Step S220). Then, the calculated average ratio is compared with the target average ratio (step S221). When the average ratio is larger than the target average ratio (step S221: Yes), steps S210 to S219 are executed as in the first embodiment.
[0097]
After the error adjustment processing (step S219), the average ratio is calculated from the maximum time and the minimum time of the adjusted internal address check time (step S220), and the calculated average ratio and target average ratio are calculated. Are compared (step S221). On the other hand, when the average ratio has become equal to or less than the target average ratio (step S221: No), the process proceeds to step S205.
[0098]
According to the present embodiment, the adjustment process of the internal address search range is continued until the average ratio based on the internal address inspection time calculated by one internal address inspection process reaches the target average ratio. That is, as described in the first embodiment, when the adjustment process is performed after the initial check process (see FIG. 9), the adjusted internal address check time is shown in the internal address check time item 47 in FIG. Content.
[0099]
When calculating the leveling ratio from the internal address search time in FIG. 12, the maximum internal address check time is 20668 seconds, which is the internal address check time of the division ID “100003”, and the minimum internal address check time is the divided internal address check time. This is 8903 seconds, which is the internal address check time of ID “100001”. Therefore, the average ratio at this time is 2.32 according to the above equation (11), which is larger than the target average ratio 1.2. Repeat the adjustment process.
[0100]
Then, as shown in FIG. 18, the maximum internal address search time at this point is 14933 seconds of the division ID “100004” or “100005”, and the minimum internal address inspection time is the division ID “100001”. 14308 seconds. Then, the leveling ratio at this time is 1.04, and when the next investigation start time comes, the investigation can be performed in 14933 seconds (about 4 hours).
[0101]
According to the above-described second embodiment, the target average ratio and the average ratio are introduced, and the internal address inspection range is repeatedly adjusted in one internal address inspection process until the average ratio reaches the target average ratio. Therefore, the internal address check time can be more efficiently reduced than in the IP address management device 1 of the first embodiment.
[0102]
Further, according to the above-described second embodiment, the adjustment is repeatedly executed until the average ratio reaches the target average ratio. However, the number of repetitions is set in advance, and when the number of times is reached, The adjustment may be stopped even if the average ratio has not reached the target average ratio.
[0103]
According to the above-described second embodiment, the target attainment determination means determines whether or not the average ratio has reached the target target average ratio. However, the target arrival determination unit is not limited to the average ratio. For example, a time interval between the maximum address search time and the minimum address search time in the address search time may be used, or the maximum address search time may be used.
[0104]
Further, in each of the above-described embodiments, each of the investigation processing units 20 measures the execution time by the ping command execution unit 21 and integrates the execution time measured by the internal address investigation time calculation unit 22 to calculate the internal time. The address check time is calculated, but by measuring the time from the transmission of the ping command addressed to the head IP address to the reception of an echo reply from the tail IP address or the time of timeout in the allocated internal address search range, The internal address check time may be calculated.
[0105]
As described above, according to the first and second embodiments, it is possible to reduce the time required to search the IP address on the network 2. In particular, by repeatedly executing the internal address checking process and the adjusting process of the internal address checking range, each internal address checking time is approximated, and the internal address checking time can be efficiently reduced. By shortening the internal address check time, it is possible to manage the IP address on the network 2 safely and appropriately.
[0106]
Further, there is an effect that the necessity of introducing a plurality of management devices is reduced and an inexpensive IP address management device can be provided. As a result, there is an effect that the operational management can be improved and simplified. Further, by shortening the examination time, the examination process of the IP address can be completed while the information equipment 3 connected to the network 2 is operating, and the accuracy of the IP address management can be improved. As a result, it is possible to investigate even the information device 3 which may be used off the network 2 while connected to the network 2, and to detect the information device 3 which illegally uses a free IP address. Can be.
[0107]
Further, even if the IP address space is changed due to the change of the network 2, the internal address search time can be automatically reduced by a simple input operation of re-registering the IP address space to be checked. it can. In addition, even if there is a change in the IP address space such as a move due to addition / removal of a device or a change in personnel, an optimum investigation process can be automatically executed. As a result, security, reliability, and operability of the entire network management can be improved.
[0108]
The IP address management method described in the present embodiment can be realized by executing a prepared program on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The program may be a transmission medium that can be distributed via the network 2 such as the Internet.
[0109]
(Supplementary Note 1) An IP address management method executed in a system having an internal address check table that records a predetermined address check range to be checked and a time required for checking the address check range in association with each other,
An address search range input step of inputting the address search range from an IP address space including a plurality of IP addresses;
An address search range division step of dividing the address search range input in the address search range input step into a plurality of internal address check ranges and recording the internal address check table in the internal address check table;
A first internal address checking step of performing, in parallel, for each of the plurality of internal address checking ranges, a check on the use state of the IP addresses existing in the plurality of internal address checking ranges divided by the address checking range dividing step; ,
A first internal address check time calculating step of calculating the time required for the check for each of the plurality of internal address check ranges checked in the first internal address check step and recording the time in the internal address check table;
A first internal unit that adjusts a plurality of internal address search ranges checked in the first internal address checking step so that the times calculated in the first internal address checking time calculating step are close to each other. Address investigation range adjustment process,
An IP address management method comprising:
[0110]
(Supplementary Note 2) Investigation of the use state of the IP addresses existing in the plurality of internal address search ranges adjusted in the first internal address search range adjustment step is performed for each of the adjusted plurality of internal address search ranges. A second internal address checking process performed in parallel;
A second internal address check time calculating step of calculating a time required for a check for each of the plurality of internal address check ranges checked in the second internal address check step;
A second internal unit that adjusts a plurality of internal address check ranges checked in the second internal address check process so that each time calculated in the second internal address check time calculation process approximates each other. Address investigation range adjustment process,
2. The IP address management method according to claim 1, further comprising:
[0111]
(Supplementary Note 3) an adjustment result calculating step of calculating an adjustment result from at least a maximum time among the times calculated in the first internal address checking time calculating step;
A target attainment determination step of determining whether or not the adjustment result obtained from the adjustment result calculation step has reached a preset target value;
A third internal address for calculating a time required for a search for each of the plurality of internal address search ranges adjusted in the first internal address check range adjustment step, based on a determination result determined in the target arrival determination step; Survey time calculation process,
A third adjustment of the plurality of internal address search ranges adjusted by the first internal address search range adjustment step so that the times calculated by the third internal address search time calculation step are close to each other; Internal address investigation range adjustment process,
2. The IP address management method according to claim 1, further comprising:
[0112]
(Supplementary Note 4) The third internal address search time calculating step includes, when the determination result reaches the target value, a plurality of internal address check ranges adjusted by the first internal address check range adjusting step. Stop calculating the time required for each of the surveys, and if the determination result does not reach the target value, a plurality of internal address survey ranges adjusted by the first internal address survey range adjusting step are set. 4. The IP address management method according to claim 4, wherein a time required for the investigation is calculated.
[0113]
(Supplementary Note 5) The adjustment result is the largest one of the plurality of calculated times, the ratio between the largest one and the smallest one of the plurality of calculated times, or the plurality of calculated times. 5. The IP address management method according to claim 3, wherein the method is selected from a difference between a largest one and a smallest one.
[0114]
(Supplementary Note 6) a fourth internal address check time calculating step of calculating a time required for checking for each of the plurality of internal address check ranges adjusted in the first internal address check range adjusting step;
A fourth adjustment of the plurality of internal address search ranges adjusted in the first internal address search range adjustment step so that the respective times calculated in the fourth internal address search time calculation step are close to each other. Internal address investigation range adjustment process,
2. The IP address management method according to claim 1, further comprising:
[0115]
(Supplementary Note 7) An address search range input step of inputting a predetermined address search range to be checked out of an IP address space including a plurality of IP addresses,
An address search range division step of dividing the address search range input in the address search range input step into a plurality of internal address search ranges;
A first internal address checking step of performing, in parallel, for each of the plurality of internal address checking ranges, a check on the use state of the IP addresses existing in the plurality of internal address checking ranges divided by the address checking range dividing step; When,
A first internal address check time calculating step of calculating a time required for a check for each of a plurality of internal address check ranges checked by the internal address check step;
A first internal address search range adjustment step of adjusting the plurality of internal address search ranges so that the times calculated by the address check time calculation step are close to each other;
Address management program for causing a computer to execute the following.
[0116]
(Supplementary Note 8) Investigation of the use state of the IP addresses existing in the plurality of internal address search ranges adjusted in the first internal address search range adjustment step is performed for each of the adjusted plurality of internal address search ranges. A second internal address checking process performed in parallel;
A second internal address checking time calculating step of calculating a time required for checking for each of the plurality of internal address checking ranges checked in the second internal address checking step;
A second adjustment for adjusting a plurality of internal address search ranges checked in the second internal address checking step so that the times calculated in the second internal address checking time calculating step are close to each other. Internal address investigation range adjustment process,
8. The IP address management program according to claim 7, wherein
[0117]
(Supplementary Note 9) an adjustment result calculation step of calculating an adjustment result from at least a maximum time among the times calculated in the first internal address check time calculation step;
A target arrival determination step of determining whether the adjustment result obtained from the adjustment result calculation step has reached a preset target value,
A third internal address for calculating a time required for a search for each of the plurality of internal address search ranges adjusted in the first internal address check range adjusting step, based on a determination result determined in the target arrival determination step; Survey time calculation process,
The third internal address checking range is adjusted between the plurality of internal address checking ranges adjusted in the first internal address checking range adjusting step so that the respective times calculated in the third internal address checking time calculating step are close to each other. (3) an internal address investigation range adjustment step;
8. The IP address management program according to claim 7, wherein
[0118]
(Supplementary Note 10) Address search range input means for inputting a predetermined address search range to be checked out of an IP address space including a plurality of IP addresses,
A plurality of internal address checking means for checking the use state of the IP address;
Address search range dividing means for dividing the address search range input by the address search range input means into a plurality of internal address search ranges equal to or less than the number of the internal address search means;
A distributing means for distributing the internal address investigation ranges divided by the address investigation range dividing means one by one to each of the same number of internal address investigation means as the number of divisions of the internal address investigation range among the plurality of internal address investigation means; When,
Inspection of the use state of the IP address existing in the allocated internal address search range is executed in parallel to each of the internal address inspection means to which the divided internal address search range has been allocated by the allocation means. Investigation processing control means to control
An internal address investigation time calculation means for calculating a time required for an investigation for each internal address investigation range allocated by the allocation means,
An internal address search range adjustment unit that adjusts the plurality of internal address search ranges so that each time calculated by the internal address search time calculation unit is close to each other;
An IP address management device, comprising:
[0119]
(Supplementary Note 11) The allocating means includes: an internal address adjusted by the internal address checking range adjusting means, each of the plurality of internal address checking means having the same number as the number of divisions of the internal address checking range. Allocate the address search range one by one,
The investigation processing control means includes, for each of the internal address investigation means to which the internal address investigation range adjusted by the internal address investigation range adjustment means has been allocated, an IP address existing in the allocated internal address investigation range. 11. The IP address management device according to supplementary note 10, wherein control is performed such that the investigation on the usage state is executed in parallel.
[0120]
(Supplementary Note 12) The internal address check time calculating means calculates a time required for checking for each internal address check range adjusted by the internal address check range adjusting means,
The internal address search range adjustment means is configured to calculate the internal address search time calculation means and adjust the internal address search range adjustment means so that the time required for each internal address search range is similar to each other. 13. The IP address management device according to claim 10, wherein adjustment of a plurality of internal address search ranges is performed.
[0121]
(Supplementary Note 13) Adjustment result calculation means for calculating an adjustment result from at least the largest of the times calculated by the internal address investigation time calculation means;
An adjustment result obtained from the adjustment result calculation means, a target arrival determination means for determining whether or not a predetermined target value has been reached,
The internal address investigation time calculation means calculates the time required for the investigation for each internal address investigation range adjusted by the internal address investigation range adjustment means, based on the determination result determined by the target arrival determination means. 13. The IP address management device according to supplementary note 12, wherein
[0122]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the time required for checking an IP address on a network. In particular, by repeatedly performing the internal address check processing and the internal address check range adjustment processing, the time required for the check is leveled and the time required for the check can be efficiently reduced. And, by shortening the time required for this investigation, there is an effect that IP addresses on the network can be safely and appropriately managed.
[0123]
Further, there is an effect that the necessity of introducing a plurality of management devices is reduced and an inexpensive IP address management device can be provided. As a result, there is an effect that the operational management can be improved and simplified. Further, by shortening the time required for the investigation, the investigation processing of the IP address can be completed while the information equipment connected to the network is operating, and the accuracy of the IP address management can be improved. This has the effect.
[0124]
As a result, it is possible to investigate even information devices that may be used off the network during connection to the network, and it is also possible to detect information devices that use a vacant IP address illegally. To play.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration in which an IP address management device and an information device according to an embodiment of the present invention are connected to a network;
FIG. 2 is a block diagram illustrating a hardware configuration of the IP address management device according to the embodiment of the present invention;
FIG. 3 is a block diagram illustrating a functional configuration of the IP address management device according to the first embodiment of the present invention;
FIG. 4 is an explanatory diagram illustrating an address examination table of the IP address management device according to the first embodiment of the present invention;
FIG. 5 is an explanatory diagram showing an internal address examination table of the IP address management device according to the first embodiment of the present invention;
FIG. 6 is a flowchart of a division registration processing procedure of the IP address management device according to the first embodiment of the present invention;
FIG. 7 is an explanatory diagram showing a registration screen in a division registration process of the IP address management device according to the first embodiment of the present invention;
FIG. 8 is a flowchart illustrating an adjustment processing procedure and an investigation processing procedure of the IP address management device according to the first embodiment of the present invention;
FIG. 9 is an explanatory diagram showing a state at the time of the first check processing of the internal address check table according to the first embodiment of the present invention;
FIG. 10 is a flowchart of an internal address search range adjustment processing procedure of the IP address management device according to the first embodiment of the present invention;
FIG. 11 is a flowchart of an internal address checking process performed by the IP address management device according to the first embodiment;
FIG. 12 is an explanatory diagram showing a state at the time of a first internal address investigation range adjustment process according to the first embodiment of the present invention;
FIG. 13 is an explanatory diagram of an address examination table of the IP address management device according to the second embodiment of the present invention;
FIG. 14 is a block diagram illustrating a functional configuration of an IP address management device according to a second embodiment of the present invention;
FIG. 15 is a flowchart illustrating an internal address search range adjustment processing procedure of the IP address management device according to the second embodiment of the present invention;
FIG. 16 is an explanatory diagram showing a registration screen in a division registration process of the IP address management device according to the second embodiment of the present invention;
FIG. 17 is a flowchart of an internal address search range adjustment process performed by the IP address management device according to the second embodiment of the present invention;
FIG. 18 is an explanatory diagram showing a state at the time of internal address investigation range adjustment processing of the internal address investigation table according to the second embodiment of the present invention;
[Explanation of symbols]
1 IP address management device
11 Internal address check table
12 Input section
14 Address investigation range division
17 Internal address search range adjustment unit
18 Sorting part
19 Investigation processing control unit
20 Survey Processing Department
22 Internal address investigation time calculation unit
23 Adjustment result calculator
24 Goal reach judgment section

Claims (5)

An IP address management method executed in a system having an internal address check table that records a predetermined address check range to be checked and a time required for checking the address check range in association with each other,
An address search range input step of inputting the address search range from an IP address space including a plurality of IP addresses;
An address search range division step of dividing the address search range input in the address search range input step into a plurality of internal address check ranges and recording the internal address check table in the internal address check table;
A first internal address checking step of performing, in parallel, for each of the plurality of internal address checking ranges, a check on the use state of the IP addresses existing in the plurality of internal address checking ranges divided by the address checking range dividing step; ,
A first internal address check time calculating step of calculating the time required for the check for each of the plurality of internal address check ranges checked in the first internal address check step and recording the time in the internal address check table;
A first internal unit that adjusts a plurality of internal address search ranges checked in the first internal address checking step so that the times calculated in the first internal address checking time calculating step are close to each other. Address investigation range adjustment process,
An IP address management method comprising: Investigation of the use state of the IP addresses existing in the plurality of internal address search ranges adjusted in the first internal address search range adjustment step is performed in parallel for each of the adjusted plurality of internal address search ranges. (2) an internal address check process;
A second internal address check time calculating step of calculating a time required for a check for each of the plurality of internal address check ranges checked in the second internal address check step;
A second internal unit that adjusts a plurality of internal address check ranges checked in the second internal address check process so that each time calculated in the second internal address check time calculation process approximates each other. Address investigation range adjustment process,
2. The IP address management method according to claim 1, further comprising: An adjustment result calculation step of calculating an adjustment result from at least the largest of the times calculated by the first internal address check time calculation step;
A target attainment determination step of determining whether or not the adjustment result obtained from the adjustment result calculation step has reached a preset target value;
A third internal address for calculating a time required for a search for each of the plurality of internal address search ranges adjusted in the first internal address check range adjustment step, based on a determination result determined in the target arrival determination step; Survey time calculation process,
A third adjustment of the plurality of internal address search ranges adjusted by the first internal address search range adjustment step so that the times calculated by the third internal address search time calculation step are close to each other; Internal address investigation range adjustment process,
2. The IP address management method according to claim 1, further comprising: An address search range input step of inputting a predetermined address search range to be checked out of an IP address space including a plurality of IP addresses;
An address search range division step of dividing the address search range input in the address search range input step into a plurality of internal address search ranges;
A first internal address checking step of performing, in parallel, for each of the plurality of internal address checking ranges, a check on the use state of the IP addresses existing in the plurality of internal address checking ranges divided by the address checking range dividing step; When,
A first internal address check time calculating step of calculating a time required for a check for each of a plurality of internal address check ranges checked by the internal address check step;
A first internal address search range adjustment step of adjusting the plurality of internal address search ranges so that the times calculated by the address check time calculation step are close to each other;
Address management program for causing a computer to execute the following. Address search range input means for inputting a predetermined address search range to be checked out of an IP address space including a plurality of IP addresses;
A plurality of internal address checking means for checking the use state of the IP address;
Address search range dividing means for dividing the address search range input by the address search range input means into a plurality of internal address search ranges equal to or less than the number of the internal address search means;
A distributing means for distributing the internal address investigation ranges divided by the address investigation range dividing means one by one to each of the same number of internal address investigation means as the number of divisions of the internal address investigation range among the plurality of internal address investigation means; When,
Inspection of the use state of the IP address existing in the allocated internal address search range is executed in parallel to each of the internal address inspection means to which the divided internal address search range has been allocated by the allocation means. Investigation processing control means to control
An internal address investigation time calculation means for calculating a time required for an investigation for each internal address investigation range allocated by the allocation means,
An internal address search range adjustment unit that adjusts the plurality of internal address search ranges so that each time calculated by the internal address search time calculation unit is close to each other;
An IP address management device, comprising:

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