List of assigned /8 IPv4 address blocks

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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[edit]

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 [1]. 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[edit]

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 3 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[edit]

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[citation needed] 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[edit]

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 APNIC 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[edit]

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 3 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[edit]

Notes[edit]

  1. ^ "Assigned Numbers (RFC 790)". Internet Engineering Task Force. September 1981. Retrieved 28 August 2013. 
  2. ^ "Public Data Network Numbers". Internet Assigned Numbers Authority. 24 June 2010. Retrieved 27 March 2011. 
  3. ^ "Network 24 - Cable Block". Internet Assigned Numbers Authority. 11 May 2001. Retrieved 27 March 2011. 
  4. ^ "IPv4 IANA Free Pool Depletion – FAQ". American Registry for Internet Numbers. Retrieved 27 March 2011. 
  5. ^ van Beijnum, Iljitsch (September 2007). "IPv4 Address Space: 2.46 Billion Down, 1.25 Billion to Go" 10 (3). Retrieved 27 March 2011. 

References[edit]