INTERNET PROTOCOL V4 ADDRESS SPACE (last updated 30 June 2005) 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 [RFC1466] documents most of these allocations. Address Block Date Registry - Purpose Notes or Reference ----- ------ --------------------------- ------------------ 000/8 Sep 81 IANA - Reserved 001/8 Sep 81 IANA - Reserved 002/8 Sep 81 IANA - Reserved 003/8 May 94 General Electric Company 004/8 Dec 92 Bolt Beranek and Newman Inc. 005/8 Jul 95 IANA - Reserved 006/8 Feb 94 Army Information Systems Center 007/8 Apr 95 IANA - Reserved 008/8 Dec 92 Bolt Beranek and Newman Inc. 009/8 Aug 92 IBM 010/8 Jun 95 IANA - Private Use See [RFC1918] 011/8 May 93 DoD Intel Information Systems 012/8 Jun 95 AT&T Bell Laboratories 013/8 Sep 91 Xerox Corporation 014/8 Jun 91 IANA - Public Data Network 015/8 Jul 94 Hewlett-Packard Company 016/8 Nov 94 Digital Equipment Corporation 017/8 Jul 92 Apple Computer Inc. 018/8 Jan 94 MIT 019/8 May 95 Ford Motor Company 020/8 Oct 94 Computer Sciences Corporation 021/8 Jul 91 DDN-RVN 022/8 May 93 Defense Information Systems Agency 023/8 Jul 95 IANA - Reserved 024/8 May 01 ARIN - Cable Block (Formerly IANA - Jul 95) 025/8 Jan 95 Royal Signals and Radar Establishment 026/8 May 95 Defense Information Systems Agency 027/8 Apr 95 IANA - Reserved 028/8 Jul 92 DSI-North 029/8 Jul 91 Defense Information Systems Agency 030/8 Jul 91 Defense Information Systems Agency 031/8 Apr 99 IANA - Reserved 032/8 Jun 94 Norsk Informasjonsteknology 033/8 Jan 91 DLA Systems Automation Center 034/8 Mar 93 Halliburton Company 035/8 Apr 94 MERIT Computer Network 036/8 Jul 00 IANA - Reserved (Formerly Stanford University - Apr 93) 037/8 Apr 95 IANA - Reserved 038/8 Sep 94 Performance Systems International 039/8 Apr 95 IANA - Reserved 040/8 Jun 94 Eli Lily and Company 041/8 Apr 05 AfriNIC (whois.afrinic.net) 042/8 Jul 95 IANA - Reserved 043/8 Jan 91 Japan Inet 044/8 Jul 92 Amateur Radio Digital Communications 045/8 Jan 95 Interop Show Network 046/8 Dec 92 Bolt Beranek and Newman Inc. 047/8 Jan 91 Bell-Northern Research 048/8 May 95 Prudential Securities Inc. 049/8 May 94 Joint Technical Command (Returned to IANA Mar 98) 050/8 May 94 Joint Technical Command (Returned to IANA Mar 98) 051/8 Aug 94 Deparment of Social Security of UK 052/8 Dec 91 E.I. duPont de Nemours and Co., Inc. 053/8 Oct 93 Cap Debis CCS 054/8 Mar 92 Merck and Co., Inc. 055/8 Apr 95 Boeing Computer Services 056/8 Jun 94 U.S. Postal Service 057/8 May 95 SITA 058/8 Apr 04 APNIC (whois.apnic.net) 059/8 Apr 04 APNIC (whois.apnic.net) 060/8 Apr 03 APNIC (whois.apnic.net) 061/8 Apr 97 APNIC (whois.apnic.net) 062/8 Apr 97 RIPE NCC (whois.ripe.net) 063/8 Apr 97 ARIN (whois.arin.net) 064/8 Jul 99 ARIN (whois.arin.net) 065/8 Jul 00 ARIN (whois.arin.net) 066/8 Jul 00 ARIN (whois.arin.net) 067/8 May 01 ARIN (whois.arin.net) 068/8 Jun 01 ARIN (whois.arin.net) 069/8 Aug 02 ARIN (whois.arin.net) 070/8 Jan 04 ARIN (whois.arin.net) 071/8 Aug 04 ARIN (whois.arin.net) 072/8 Aug 04 ARIN (whois.arin.net) 073/8 Mar 05 ARIN (whois.arin.net) 074/8 Jun 05 ARIN (whois.arin.net) 075/8 Jun 05 ARIN (whois.arin.net) 076/8 Jun 05 ARIN (whois.arin.net) 077/8 Sep 81 IANA - Reserved 078/8 Sep 81 IANA - Reserved 079/8 Sep 81 IANA - Reserved 080/8 Apr 01 RIPE NCC (whois.ripe.net) 081/8 Apr 01 RIPE NCC (whois.ripe.net) 082/8 Nov 02 RIPE NCC (whois.ripe.net) 083/8 Nov 03 RIPE NCC (whois.ripe.net) 084/8 Nov 03 RIPE NCC (whois.ripe.net) 085/8 Apr 04 RIPE NCC (whois.ripe.net) 086/8 Apr 04 RIPE NCC (whois.ripe.net) 087/8 Apr 04 RIPE NCC (whois.ripe.net) 088/8 Apr 04 RIPE NCC (whois.ripe.net) 089/8 Jun 05 RIPE NCC (whois.ripe.net) 090/8 Jun 05 RIPE NCC (whois.ripe.net) 091/8 Jun 05 RIPE NCC (whois.ripe.net) 092/8 Sep 81 IANA - Reserved 093/8 Sep 81 IANA - Reserved 094/8 Sep 81 IANA - Reserved 095/8 Sep 81 IANA - Reserved 096/8 Sep 81 IANA - Reserved 097/8 Sep 81 IANA - Reserved 098/8 Sep 81 IANA - Reserved 099/8 Sep 81 IANA - Reserved 100/8 Sep 81 IANA - Reserved 101/8 Sep 81 IANA - Reserved 102/8 Sep 81 IANA - Reserved 103/8 Sep 81 IANA - Reserved 104/8 Sep 81 IANA - Reserved 105/8 Sep 81 IANA - Reserved 106/8 Sep 81 IANA - Reserved 107/8 Sep 81 IANA - Reserved 108/8 Sep 81 IANA - Reserved 109/8 Sep 81 IANA - Reserved 110/8 Sep 81 IANA - Reserved 111/8 Sep 81 IANA - Reserved 112/8 Sep 81 IANA - Reserved 113/8 Sep 81 IANA - Reserved 114/8 Sep 81 IANA - Reserved 115/8 Sep 81 IANA - Reserved 116/8 Sep 81 IANA - Reserved 117/8 Sep 81 IANA - Reserved 118/8 Sep 81 IANA - Reserved 119/8 Sep 81 IANA - Reserved 120/8 Sep 81 IANA - Reserved 121/8 Sep 81 IANA - Reserved 122/8 Sep 81 IANA - Reserved 123/8 Sep 81 IANA - Reserved 124/8 Jan 05 APNIC (whois.apnic.net) 125/8 Jan 05 APNIC (whois.apnic.net) 126/8 Jan 05 APNIC (whois.apnic.net) 127/8 Sep 81 IANA - Reserved See [RFC3330] 128/8 May 93 Various Registries 129/8 May 93 Various Registries 130/8 May 93 Various Registries 131/8 May 93 Various Registries 132/8 May 93 Various Registries 133/8 May 93 Various Registries 134/8 May 93 Various Registries 135/8 May 93 Various Registries 136/8 May 93 Various Registries 137/8 May 93 Various Registries 138/8 May 93 Various Registries 139/8 May 93 Various Registries 140/8 May 93 Various Registries 141/8 May 93 Various Registries 142/8 May 93 Various Registries 143/8 May 93 Various Registries 144/8 May 93 Various Registries 145/8 May 93 Various Registries 146/8 May 93 Various Registries 147/8 May 93 Various Registries 148/8 May 93 Various Registries 149/8 May 93 Various Registries 150/8 May 93 Various Registries 151/8 May 93 Various Registries 152/8 May 93 Various Registries 153/8 May 93 Various Registries 154/8 May 93 Various Registries 155/8 May 93 Various Registries 156/8 May 93 Various Registries 157/8 May 93 Various Registries 158/8 May 93 Various Registries 159/8 May 93 Various Registries 160/8 May 93 Various Registries 161/8 May 93 Various Registries 162/8 May 93 Various Registries 163/8 May 93 Various Registries 164/8 May 93 Various Registries 165/8 May 93 Various Registries 166/8 May 93 Various Registries 167/8 May 93 Various Registries 168/8 May 93 Various Registries 169/8 May 93 Various Registries 170/8 May 93 Various Registries 171/8 May 93 Various Registries 172/8 May 93 Various Registries 173/8 Apr 03 IANA - Reserved 174/8 Apr 03 IANA - Reserved 175/8 Apr 03 IANA - Reserved 176/8 Apr 03 IANA - Reserved 177/8 Apr 03 IANA - Reserved 178/8 Apr 03 IANA - Reserved 179/8 Apr 03 IANA - Reserved 180/8 Apr 03 IANA - Reserved 181/8 Apr 03 IANA - Reserved 182/8 Apr 03 IANA - Reserved 183/8 Apr 03 IANA - Reserved 184/8 Apr 03 IANA - Reserved 185/8 Apr 03 IANA - Reserved 186/8 Apr 03 IANA - Reserved 187/8 Apr 03 IANA - Reserved 188/8 May 93 Various Registries 189/8 Jun 05 LACNIC (whois.lacnic.net) 190/8 Jun 05 LACNIC (whois.lacnic.net) 191/8 May 93 Various Registries 192/8 May 93 Various Registries 193/8 May 93 RIPE NCC (whois.ripe.net) 194/8 May 93 RIPE NCC (whois.ripe.net) 195/8 May 93 RIPE NCC (whois.ripe.net) 196/8 May 93 Various Registries 197/8 May 93 IANA - Reserved 198/8 May 93 Various Registries 199/8 May 93 ARIN (whois.arin.net) 200/8 Nov 02 LACNIC (whois.lacnic.net) 201/8 Apr 03 LACNIC (whois.lacnic.net) 202/8 May 93 APNIC (whois.apnic.net) 203/8 May 93 APNIC (whois.apnic.net) 204/8 Mar 94 ARIN (whois.arin.net) 205/8 Mar 94 ARIN (whois.arin.net) 206/8 Apr 95 ARIN (whois.arin.net) 207/8 Nov 95 ARIN (whois.arin.net) 208/8 Apr 96 ARIN (whois.arin.net) 209/8 Jun 96 ARIN (whois.arin.net) 210/8 Jun 96 APNIC (whois.apnic.net) 211/8 Jun 96 APNIC (whois.apnic.net) 212/8 Oct 97 RIPE NCC (whois.ripe.net) 213/8 Mar 99 RIPE NCC (whois.ripe.net) 214/8 Mar 98 US-DOD 215/8 Mar 98 US-DOD 216/8 Apr 98 ARIN (whois.arin.net) 217/8 Jun 00 RIPE NCC (whois.ripe.net) 218/8 Dec 00 APNIC (whois.apnic.net) 219/8 Sep 01 APNIC (whois.apnic.net) 220/8 Dec 01 APNIC (whois.apnic.net) 221/8 Jul 02 APNIC (whois.apnic.net) 222/8 Feb 03 APNIC (whois.apnic.net) 223/8 Apr 03 IANA - Reserved 224/8 Sep 81 IANA - Multicast 225/8 Sep 81 IANA - Multicast 226/8 Sep 81 IANA - Multicast 227/8 Sep 81 IANA - Multicast 228/8 Sep 81 IANA - Multicast 229/8 Sep 81 IANA - Multicast 230/8 Sep 81 IANA - Multicast 231/8 Sep 81 IANA - Multicast 232/8 Sep 81 IANA - Multicast 233/8 Sep 81 IANA - Multicast 234/8 Sep 81 IANA - Multicast 235/8 Sep 81 IANA - Multicast 236/8 Sep 81 IANA - Multicast 237/8 Sep 81 IANA - Multicast 238/8 Sep 81 IANA - Multicast 239/8 Sep 81 IANA - Multicast 240/8 Sep 81 IANA - Reserved 241/8 Sep 81 IANA - Reserved 242/8 Sep 81 IANA - Reserved 243/8 Sep 81 IANA - Reserved 244/8 Sep 81 IANA - Reserved 245/8 Sep 81 IANA - Reserved 246/8 Sep 81 IANA - Reserved 247/8 Sep 81 IANA - Reserved 248/8 Sep 81 IANA - Reserved 249/8 Sep 81 IANA - Reserved 250/8 Sep 81 IANA - Reserved 251/8 Sep 81 IANA - Reserved 252/8 Sep 81 IANA - Reserved 253/8 Sep 81 IANA - Reserved 254/8 Sep 81 IANA - Reserved 255/8 Sep 81 IANA - Reserved Reference --------- [RFC1466] [RFC1918] [RFC3330] []