List of assigned /8 IPv4 address blocks
Some large /8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.
Each /8 block contains 16,777,216 addresses.
As IPv4 address exhaustion has advanced to its final stages, some organizations, such as Stanford University, formerly using 36.0.0.0/8, have returned their allocated blocks to assist in the delay of the exhaustion date.
List of reserved /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 6890). | |
| 10.0.0.0/8 | IANA - Private Use | 1995-06 | Reserved for Private-Use Networks (RFC 1918). Formerly ARPANET.[1] | |
| 127.0.0.0/8 | IANA - Loopback | 1981-09 | 127.0.0.0/8 is reserved for Loopback (RFC 6890). | |
| 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. |
List of assigned /8 blocks
| Block | Organization | IANA date | RIR date | Notes |
|---|---|---|---|---|
| 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. |
| 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 | |
| 12.0.0.0/8 | AT&T Services | 1995-06 | 1983-08-23 | Originally AT&T Bell Laboratories, retained by AT&T when Bell Labs was spun off to Lucent Technologies in 1996. |
| 15.0.0.0/8 | Hewlett-Packard Company | 1994-07 | 1994-07-01 | |
| 16.0.0.0/8 | Hewlett-Packard Company | 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 | |
| 32.0.0.0/8 | AT&T Global Network Services | 1994-06 | 1990-05-30 | Originally Norsk Informasjonsteknologi. IBM acquired Norsk Informasjonsteknologi (Norway) in 1995. Updated to AT&T Global Network Services in 2007-08. Note: As of 2015-07-02 the block was divided into three smaller blocks all controlled by AT&T-related entities. |
| 34.0.0.0/8 | Halliburton Company | 1993-03 | 1991-03-11 | |
| 38.0.0.0/8 | PSINet, Inc. | 1994-09 | 1991-04-16 | PSINet, then Cogent Communications. |
| 44.0.0.0/8 | Amateur Radio Digital Communications | 1992-07 | 1992-07-01 | |
| 48.0.0.0/8 | Prudential Securities Inc. | 1995-05 | 1990-12-07 | The Prudential Insurance Company of America. |
| 56.0.0.0/8 | US Postal Service | 1994-06 | 1992-11-02 |
List of assigned /8 blocks to the United States Department of Defense
| Block | Organization | IANA date | RIR date | Notes |
|---|---|---|---|---|
| 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. |
| 11.0.0.0/8 | DoD Intel Information Systems | 1993-05 | 1984-01-19 | |
| 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). |
| 26.0.0.0/8 | Defense Information Systems Agency | 1995-05 | 1995-05-01 | DoD Network Information Center (DNIC). |
| 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). |
| 33.0.0.0/8 | DLA Systems Automation Center | 1991-01 | 1991-01-01 | DoD Network Information Center (DNIC). |
| 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. |
| 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). |
List of assigned /8 blocks to the Regional Internet Registries
Map of Regional Internet Registries
The Regional Internet Registries (RIR) allocate IPs within a particular region of the world.
| Block | Organization | IANA date | RIR date | Notes |
|---|---|---|---|---|
| 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. | |
| 5.0.0.0/8 | RIPE NCC | Formerly IANA - Reserved 1995-07. | ||
| 14.0.0.0/8 | APNIC | 2010-04 | Starting 1991-06-01, was used to map Public Data Network (X.121) addresses to IP addresses. Returned to IANA 2008-01-22. This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information.[2] | |
| 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.[3] Updated to ARIN not before 2007. |
| 25.0.0.0/8 | RIPE NCC | As of 2005-08-23 entire block assigned to UK Ministry of Defence | ||
| 27.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1995-04. | |
| 31.0.0.0/8 | RIPE NCC | 2010-05 | 2010-05-18 | Formerly IANA - Reserved 1991-04. |
| 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. | |
| 39.0.0.0/8 | APNIC | 2011-01 | Formerly IANA - Reserved 1995-04. | |
| 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 | 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. |
| 45.0.0.0/8 | 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).[4] |
| 46.0.0.0/8 | RIPE NCC | 2009-09 | Formerly Bolt Beranek and Newman Inc. 1992-12. Returned to IANA in 2007-04.[5] Updated to IANA - Reserved in 2007-04. | |
| 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 | RIPE NCC | Formerly UK Government Department for Work and Pensions. | ||
| 53.0.0.0/8 | RIPE NCC | As of some date before 2015-05-05 the entire block assigned to Daimler AG. | ||
| 57.0.0.0/8 | RIPE NCC | Formerly SITA. | ||
| 60.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 61.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 88.0.0.0/8 | RIPE NCC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 111.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 114.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 107.0.0.0/8 | ARIN | 2010-02 | 2010-02-11 | |
| 120.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 128.0.0.0/8 | RIPE NCC | Various Registries (Maintained by RIPE NCC). 128.0.0.0 is the start address of formerly "Class B". | ||
| 169.0.0.0/8 | 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 6890). |
| 172.0.0.0/8 | 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). |
| 177.0.0.0/8 | LACNIC | 2010-06 | ||
| 179.0.0.0/8 | LACNIC | 2011-02 | ||
| 181.0.0.0/8 | LACNIC | 2010-06 | ||
| 183.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. | |
| 186.0.0.0/8 | LACNIC | 2007-09 | ||
| 187.0.0.0/8 | LACNIC | 2007-09 | ||
| 189.0.0.0/8 | LACNIC | 1995-06 | ||
| 190.0.0.0/8 | LACNIC | 1995-06 | ||
| 191.0.0.0/8 | LACNIC | 1993-05 | ||
| 192.0.0.0/8 | 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 | ARIN | 1993-05 | Various Registries (Maintained by ARIN). 198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing (RFC 6890). 198.51.100.0/24 reserved for TEST-NET-2 (RFC 5737). | |
| 200.0.0.0/8 | LACNIC | 2002-11 | ||
| 201.0.0.0/8 | LACNIC | 2003-04 | ||
| 202.0.0.0/8 | APNIC | 2009-10 | 202.123.0.0/19 transferred to AfriNIC | |
| 203.0.0.0/8 | APNIC | 1993-05 | 203.0.113.0/24 reserved for TEST-NET-3 (RFC 5737). | |
| 217.0.0.0/8 | RIPE NCC | 2013-07 | 2013-07-29 | RIPE Network Coordination Centre |
| 218.0.0.0/8 | APNIC | 2010-01 | Formerly IANA - Reserved 1981-09. |
Note that this list may not include current assignments of /8 blocks to all regional or national Internet registries.
Original list of IPv4 assigned address blocks
The original list of IPv4 address blocks can be found in RFC 790 (Postel, J., September 1981). In a previous version of the document, RFC 776 (Postel, J., January 1981), network numbers were 8-bit numbers rather than the 32-bit numbers used in IPv4. RFC 790 also added three networks not listed in RFC 776: 42.rrr.rrr.rrr, 43.rrr.rrr.rrr, and 44.rrr.rrr.rrr.
The relevant portion of RFC 790 is reproduced here with minor changes:
- 000.rrr.rrr.rrr Reserved [JBP]
- 001.rrr.rrr.rrr BBN-PR BBN Packet Radio Network [DCA2]
- 002.rrr.rrr.rrr SF-PR-1 SF Packet Radio Network [JEM]
- 003.rrr.rrr.rrr BBN-RCC BBN RCC Network [SGC]
- 004.rrr.rrr.rrr SATNET Atlantic Satellite Network [DM11]
- 005.rrr.rrr.rrr SILL-PR Ft. Sill Packet Radio Network[JEM]
- 006.rrr.rrr.rrr SF-PR-2 SF Packet Radio Network [JEM]
- 007.rrr.rrr.rrr CHAOS MIT CHAOS Network [MOON]
- 008.rrr.rrr.rrr CLARKNET SATNET subnet for Clarksburg [DM11]
- 009.rrr.rrr.rrr BRAGG-PR Ft. Bragg Packet Radio Net [JEM]
- 010.rrr.rrr.rrr ARPANET ARPANET [VGC]
- 011.rrr.rrr.rrr UCLNET University College London [PK]
- 012.rrr.rrr.rrr CYCLADES CYCLADES [VGC]
- 013.rrr.rrr.rrr Unassigned [JBP]
- 014.rrr.rrr.rrr TELENET TELENET [VGC]
- 015.rrr.rrr.rrr EPSS British Post Office EPSS [PK]
- 016.rrr.rrr.rrr DATAPAC DATAPAC [VGC]
- 017.rrr.rrr.rrr TRANSPAC TRANSPAC [VGC]
- 018.rrr.rrr.rrr LCSNET MIT LCS Network [DDC2]
- 019.rrr.rrr.rrr TYMNET TYMNET [VGC]
- 020.rrr.rrr.rrr DC-PR D.C. Packet Radio Network [VGC]
- 021.rrr.rrr.rrr EDN DCEC EDN [EC5]
- 022.rrr.rrr.rrr DIALNET DIALNET [MRC]
- 023.rrr.rrr.rrr MITRE MITRE Cablenet [APS]
- 024.rrr.rrr.rrr BBN-LOCAL BBN Local Network [SGC]
- 025.rrr.rrr.rrr RSRE-PPSN RSRE / PPSN [BD2]
- 026.rrr.rrr.rrr AUTODIN-II AUTODIN II [EC5]
- 027.rrr.rrr.rrr NOSC-LCCN NOSC / LCCN [KTP]
- 028.rrr.rrr.rrr WIDEBAND Wide Band Satellite Network [CJW2]
- 029.rrr.rrr.rrr DCN-COMSAT COMSAT Dist. Comp. Network [DLM1]
- 030.rrr.rrr.rrr DCN-UCL UCL Dist. Comp. Network [PK]
- 031.rrr.rrr.rrr BBN-SAT-TEST BBN SATNET Test Network [DM11]
- 032.rrr.rrr.rrr UCL-CR1 UCL Cambridge Ring 1 [PK]
- 033.rrr.rrr.rrr UCL-CR2 UCL Cambridge Ring 2 [PK]
- 034.rrr.rrr.rrr MATNET Mobile Access Terminal Net [DM11]
- 035.rrr.rrr.rrr NULL UCL/RSRE Null Network [BD2]
- 036.rrr.rrr.rrr SU-NET Stanford University Ethernet [MRC]
- 037.rrr.rrr.rrr DECNET Digital Equipment Network [DRL]
- 038.rrr.rrr.rrr DECNET-TEST Test Digital Equipment Net [DRL]
- 039.rrr.rrr.rrr SRINET SRI Local Network [GEOF]
- 040.rrr.rrr.rrr CISLNET CISL Multics Network [CH2]
- 041.rrr.rrr.rrr BBN-LN-TEST BBN Local Network Testbed [KTP]
- 042.rrr.rrr.rrr S1NET LLL-S1-NET [EAK]
- 043.rrr.rrr.rrr INTELPOST COMSAT INTELPOST [DLM1]
- 044.rrr.rrr.rrr AMPRNET Amateur Radio Experiment Net [HM]
See also
Notes
- ↑ "Assigned Numbers (RFC 790)". Internet Engineering Task Force. September 1981. Retrieved 28 August 2013.
- ↑ "Public Data Network Numbers". Internet Assigned Numbers Authority. 24 June 2010. Retrieved 27 March 2011.
- ↑ "Network 24 - Cable Block". Internet Assigned Numbers Authority. 11 May 2001. Retrieved 27 March 2011.
- ↑ "IPv4 IANA Free Pool Depletion – FAQ". American Registry for Internet Numbers. Retrieved 27 March 2011.
- ↑ van Beijnum, Iljitsch (September 2007). "IPv4 Address Space: 2.46 Billion Down, 1.25 Billion to Go". 10 (3). Retrieved 27 March 2011.
References
- "IANA IPv4 Address Space Registry". Internet Assigned Numbers Authority (IANA). 3 February 2011. Retrieved 27 March 2011. The authoritative up-to-date list of IANA assignments.
- "ARIN Whois Database". American Registry for Internet Numbers (ARIN). Retrieved 27 March 2011.
- Historical IP address lists:
- "INTERNET PROTOCOL ADDRESS SPACE". Internet Assigned Numbers Authority (IANA). October 2000. Archived from the original on 18 October 2000. Retrieved 27 March 2011. First version of IANA table with historical notes via the Internet Archive Wayback Machine.
- "Internet Protocol v4 Address Space". Internet Assigned Numbers Authority (IANA). September 2007. Archived from the original on 28 October 2007. Retrieved 27 March 2011. Last version of IANA table with historical notes via the Internet Archive Wayback Machine.
- Turtschi, Adrian (13 September 1999). "Complete List of Class A and Class B Networks". Adrian Turtschi. Retrieved 27 March 2011.
- Rogers, Paul (November 1999). "IP INDEX Encyclopedia". flumps.org. Archived from the original on 14 April 2001. Retrieved 27 March 2011.
- "IPv4 Addresses - the Complete Class A List". Infocellar. 5 April 2003. Retrieved 27 March 2011.
- "INTERNET PROTOCOL V4 ADDRESS SPACE". DonkBoy Internet. 30 June 2005. Retrieved 27 March 2011.
- Cromwell, Bob (13 November 2008). "The /8 or Class A Networks". Bob Cromwell. Retrieved 27 March 2011.
- Huston, Geoff (29 August 2005). "Report on the IANA IPv4 Address Registry". The Internet Society. Retrieved 27 March 2011.
- Huston, Geoff (July 2003). "IANA IPv4 Address Registry - Current Issues". CIDR Report. Retrieved 27 March 2011.
- "Global Policy for the Allocation of the Remaining IPv4 Address Space". Internet Corporation for Assigned Names and Numbers (ICANN). 6 March 2009. Retrieved 27 March 2011.
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