List of Assigned /8 Blocks
| Block | Organization | IANA Date | RIR Date | Notes |
|---|---|---|---|---|
| 0.0.0.0/8 | IANA - Local Identification | 1981-09 | Originally IANA - Reserved 1981-09. 0.0.0.0/8 reserved for self-identification (RFC 5735). | |
| 1.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 2.0.0.0/8 | RIPE NCC | 2009-10 | Formerly IANA - Reserved 1981-09. | |
| 3.0.0.0/8 | General Electric Company | 1994-05 | 1988-02-23 | |
| 4.0.0.0/8 | Level 3 Communications, Inc. | 1992-12 | 1992-12-01 | Originally Bolt Beranek and Newman Inc. (then GTE, then Genuity) 1992-12. Updated to Level 3 Communications, Inc. in 2007-04. |
| 5.0.0.0/8 | RIPE NCC | Formerly IANA - Reserved 1995-07. | ||
| 6.0.0.0/8 | Army Information Systems Center | 1994-02 | 1994-02-01 | Headquarters, USAISC. |
| 7.0.0.0/8 | Administered by ARIN | 1995-04 | 1997-11-24 | Formerly IANA - Reserved 1995-04. Entirely assigned to DoD Network Information Center (DNIC) 1997-11-24. Updated to Administered by ARIN not before 2007. |
| 8.0.0.0/8 | Level 3 Communications, Inc. | 1992-12 | 1992-12-01 | Originally Bolt Beranek and Newman Inc. (then GTE, then Genuity) 1992-12. Updated to Level 3 Communications, Inc. in 2007-04. |
| 9.0.0.0/8 | IBM | 1992-08 | 1988-12-16 | |
| 10.0.0.0/8 | IANA - Private Use | 1995-06 | Reserved for Private-Use Networks (RFC 1918). | |
| 11.0.0.0/8 | DoD Intel Information Systems | 1993-05 | 1984-01-19 | |
| 12.0.0.0/8 | AT&T Bell Laboratories | 1995-06 | 1983-08-23 | |
| 13.0.0.0/8 | Xerox Corporation | 1991-09 | 1986-04-25 | Xerox Palo Alto Research Center (PARC). |
| 14.0.0.0/8 | APNIC | 2010-04 | Formerly IANA - Public Data Network 1991-06-01, then IANA - Reserved 2008-01-22. Returned to IANA in 2008. One of the Class A networks (14.0.0.0/8) was used to map between Internet Addresses and the Public Data Network Addresses (X.121). This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information. | |
| 15.0.0.0/8 | Hewlett-Packard Company | 1994-07 | 1994-07-01 | |
| 16.0.0.0/8 | Digital Equipment Corporation | 1994-11 | 1989-05-18 | Digital Equipment Corporation, then Compaq, then Hewlett-Packard. |
| 17.0.0.0/8 | Apple Inc. | 1992-07 | 1990-04-16 | |
| 18.0.0.0/8 | MIT | 1994-01 | 1994-01-01 | |
| 19.0.0.0/8 | Ford Motor Company | 1995-05 | 1988-06-15 | |
| 20.0.0.0/8 | Computer Sciences Corporation | 1994-10 | 1989-09-04 | |
| 21.0.0.0/8 | DDN-RVN | 1991-07 | 1991-07-01 | DoD Network Information Center (DNIC). |
| 22.0.0.0/8 | Defense Information Systems Agency | 1993-05 | 1989-06-26 | DoD Network Information Center (DNIC). |
| 23.0.0.0/8 | ARIN | 2010-11 | Formerly IANA - Reserved 1995-07. | |
| 24.0.0.0/8 | ARIN | 2001-05 | 2001-05-01 | Formerly IANA - Cable Block 1995-07, then ARIN - Cable Block 2001-05. Updated to ARIN not before 2007. |
| 25.0.0.0/8 | UK Ministry of Defence | 1995-01 | 1985-01-28 | Originally Royal Signals and Radar Establishment. Updated to UK Ministry of Defence in 2006-01. |
| 26.0.0.0/8 | Defense Information Systems Agency | 1995-05 | 1995-05-01 | DoD Network Information Center (DNIC). |
| 27.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1995-04. | |
| 28.0.0.0/8 | DSI-North | 1992-07 | DoD Network Information Center (DNIC). | |
| 29.0.0.0/8 | Defense Information Systems Agency | 1991-07 | 1991-07-01 | DoD Network Information Center (DNIC). |
| 30.0.0.0/8 | Defense Information Systems Agency | 1991-07 | 1991-07-01 | DoD Network Information Center (DNIC). |
| 31.0.0.0/8 | RIPE NCC | 2010-05 | Formerly IANA - Reserved 1991-04. | |
| 32.0.0.0/8 | AT&T Global Network Services | 1994-06 | 1990-05-30 | Originally Norsk Informasjonsteknology. IBM acquired Norsk Informasjonsteknologi (Norway) in 1995. Updated to AT&T Global Network Services in 2007-08. |
| 33.0.0.0/8 | DLA Systems Automation Center | 1991-01 | 1991-01-01 | DoD Network Information Center (DNIC). |
| 34.0.0.0/8 | Halliburton Company | 1993-03 | 1991-03-11 | |
| 35.0.0.0/8 | MERIT Computer Network | 1994-04 | 1994-04-01 | |
| 36.0.0.0/8 | APNIC | 2010-10 | Formerly Stanford University 1993-04, then IANA - Reserved 2000-07. | |
| 37.0.0.0/8 | RIPE NCC | 2010-11 | Formerly IANA - Reserved 1995-04. | |
| 38.0.0.0/8 | PSINet, Inc. | 1994-09 | 1991-04-16 | PSINet, then Cogent Communications. |
| 39.0.0.0/8 | APNIC | 2011-01 | Formerly IANA - Reserved 1995-04. | |
| 40.0.0.0/8 | Eli Lilly & Company | 1994-06 | 1991-04-23 | |
| 41.0.0.0/8 | AfriNIC | 2005-04 | Formerly IANA - Reserved 1995-05. | |
| 42.0.0.0/8 | APNIC | 2010-10 | Formerly IANA - Reserved 1995-07. | |
| 43.0.0.0/8 | Administered by APNIC | 1991-01 | 1989-02-21 | Originally Japan Inet 1991-01 (IANA Date) or 1989-02-21 (RIR Date). Administered by APNIC not before 2007. |
| 44.0.0.0/8 | Amateur Radio Digital Communications | 1992-07 | 1992-07-01 | |
| 45.0.0.0/8 | Administered by ARIN | 1995-01 | 1991-09-09 | Formerly Interop Show Network 1995-01 or 1991-09-09 (RIR Date). Returned to ARIN in 2010-10 except a /15 block. In 2011 it will become available for distribution (or possibly be returned to the IANA, depending on the global policy in effect at that time). |
| 46.0.0.0/8 | RIPE NCC | 2009-09 | Formerly Bolt Beranek and Newman Inc. 1992-12. Returned to IANA in 2007-04. Updated to IANA - Reserved in 2007-04. | |
| 47.0.0.0/8 | Bell-Northern Research | 1991-01 | 1989-01-06 | Bell-Northern Research, now absorbed into Nortel. |
| 48.0.0.0/8 | Prudential Securities Inc. | 1995-05 | 1990-12-07 | The Prudential Insurance Company of America. |
| 49.0.0.0/8 | APNIC | 2010-08 | Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05. | |
| 50.0.0.0/8 | ARIN | 2010-02 | Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05. | |
| 51.0.0.0/8 | UK Government Department for Work and Pensions | 1994-08 | 1991-09-16 | |
| 52.0.0.0/8 | E.I. duPont de Nemours and Co., Inc. | 1991-12 | 1991-12-19 | |
| 53.0.0.0/8 | Cap Debis CCS | 1993-10 | 1992-03-17 | Cap Debis CCS (Daimler AG). |
| 54.0.0.0/8 | Merck and Co., Inc. | 1992-03 | 1992-03-17 | |
| 55.0.0.0/8 | DoD Network Information Center | 1995-04 | 1996-10-26 | Headquarters, USAISC. Formerly Boeing Computer Services 1995-04. Updated to DoD Network Information Center in 2007-02. |
| 56.0.0.0/8 | US Postal Service | 1994-06 | 1992-11-02 | |
| 57.0.0.0/8 | SITA | 1995-05 | 1993-06-21 | |
| 107.0.0.0/8 | ARIN | 2010-02 | 2010-02-11 | |
| 127.0.0.0/8 | IANA - Loopback | 1981-09 | 127.0.0.0/8 is reserved for Loopback (RFC 5735). | |
| 128.0.0.0/8 | Administered by RIPE | Various Registries (Maintained by RIPE). 128.0.0.0 is the start address of formerly "Class B". | ||
| 169.0.0.0/8 | Administered by ARIN | 1993-05 | 1993-05-01 | Various Registries (Maintained by ARIN). 169.254.0.0/16 (169.254.0.0–169.254.255.255) reserved for link-local addressing (RFC 5735). |
| 172.0.0.0/8 | Administered by ARIN | 1993-05 | 1993-05-01 | Various Registries (Maintained by ARIN). 172.16.0.0/12 (172.16.0.0–172.31.255.255) reserved for private networks (RFC 1918). |
| 192.0.0.0/8 | Administered by ARIN | 1993-05 | 1993-05-01 | Various Registries (Maintained by ARIN). 192.0.2.0/24 reserved for TEST-NET-1 (RFC 5737). 192.88.99.0/24 reserved for 6to4 Relay Anycast (RFC 3068). 192.168.0.0/16 (192.168.0.0–192.168.255.255) reserved for private networks (RFC 1918). 192.0.0.0/24 reserved for IANA IPv4 Special Purpose Address Registry (RFC 5736). 192.0.0.0 is the start address of formerly "Class C". |
| 198.0.0.0/8 | Administered by ARIN | 1993-05 | Various Registries (Maintained by ARIN). 198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing (RFC 5735). 198.51.100.0/24 reserved for TEST-NET-2 (RFC 5737). | |
| 203.0.0.0/8 | APNIC | 1993-05 | 203.0.113.0/24 reserved for TEST-NET-3 (RFC 5737). | |
| 214.0.0.0/8 | US-DOD | 1998-03 | 1998-03-27 | DoD Network Information Center (DNIC). |
| 215.0.0.0/8 | US-DOD | 1998-03 | 1998-06-05 | DoD Network Information Center (DNIC). |
| 224.0.0.0/8–239.0.0.0/8 | Multicast | 1981-09 | 1991-05-22 | Multicast (formerly "Class D") (RFC 5771) registered in . 224.0.0.0/4. |
| 240.0.0.0/8–255.0.0.0/8 | Future Use | 1981-09 | Reserved for future use (formerly "Class E") (RFC 1112). 255.255.255.255 is reserved for "limited broadcast" destination address (RFC 919) and (RFC 922). 240.0.0.0/4. |
Note that this list does not include all assignments of /8 blocks to the regional or national Internet registries.
Read more about this topic: List Of Assigned /8 IPv4 Address Blocks
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