INTERNET PROTOCOL ADDRESS SPACE The allocation of Internet Protocol version 4 (IPv4) address space to various registries is listed here. Originally, all the IPv4 address spaces was managed directly by the IANA. Later parts of the address space were allocated to various other registries to manage for particular purposes or regional areas of the world. RFC 1466 documents most of these allocations. Address Block Registry - Purpose Date --------------- --------------------------------------- ------ 000/8 IANA Sep 81 001/8 IANA 002/8 IANA 003/8 General Electric Company 004/8 Bolt Beranek and Newman Inc. 005/8 IANA 006/8 Army Information Systems Center 007/8 IANA 008/8 Bolt Beranek and Newman Inc. 009/8 IBM 010/8 IANA - Private Use 011/8 DoD Intel Information Systems 012/8 AT&T Bell Laboratories 013/8 Xerox Corporation 014/8 Public Data Network 015/8 Hewlett-Packard Company 016/8 Digital Equipment Corporation 017/8 Apple Computer Inc. 018/8 MIT 019/8 Ford Motor Company 020/8 Computer Sciences Corporation 021/8 DDN-RVN 022/8 Defense Information Systems Agency 023/8 BBN Systems and Technologies 024/8 IANA 025/8 Royal Signals and Radar Establishment 026/8 Defense Information Systems Agency 027/8 IANA 028/8 DSI-North 029/8 Defense Information Systems Agency 030/8 Defense Information Systems Agency 031/8 University of California 032/8 Norsk Informasjonsteknologi 033/8 DLA Systems Automation Center 034/8 Halliburton Company 035/8 MERIT Computer Network 036/8 Stanford University 037/8 IANA 038/8 Performance Systems International 039/8 IANA 040/8 Eli Lily and Company 041/8 IANA 061/8 APNIC - Pacific Rim Apr 97 062/8 RIPE NCC - Europe Apr 97 063/8 ARIN Apr 97 064-095/8 IANA - Reserved Sep 81 096-126/8 IANA - Reserved Sep 81 127/8 IANA Sep 81 128-191/8 Various Registries May 93 192-193/8 Various Registries - MultiRegional May 93 194-195/8 RIPE NCC - Europe May 93 196-197/8 Internic - Others May 93 198-199/8 Internic - North America May 93 200-201/8 Internic - Central and South America May 93 202-203/8 APNIC - Pacific Rim May 93 204-205/8 Internic - North America Mar 94 206/8 Internic - North America Apr 95 207/8 Internic - North America Nov 95 208/8 Internic - North America Apr 96 209/8 Internic - North America Jun 96 210/8 APNIC - Pacific Rim Jun 96 211/8 APNIC - Pacific Rim Jun 96 212-223/8 IANA - Reserved Sep 81 224-239/8 IANA - Multicast Sep 81 240-255/8 IANA - Reserved Sep 81 []