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List of assigned /8 IPv4 address blocks
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Some large 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 block contains 256 = 2 = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address. This means that 256 /8 address blocks fit into the entire IPv4 space.
As IPv4 address exhaustion has advanced to its final stages, some organizations, such as Stanford University, formerly using , have returned their allocated blocks (in this case to APNIC) 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 | IANALocal Identification | 1981-09 | Originally IANAReserved 1981-09. 0.0.0.0/8 reserved for self-identification. | |
| 10.0.0.0/8 | IANAPrivate Use | 1995-06 | Reserved for Private Networks. Formerly ARPANET. | |
| 127.0.0.0/8 | IANALoopback | 1981-09 | 127.0.0.0/8 is reserved for loopback. | |
| 224.0.0.0/8–239.0.0.0/8 | Multicast | 1981-09 | 1991-05-22 | Multicast (formerly "Class D") registered in [multicast addresses](https://www.iana.org/assignments/multicast-addresses) |
| 240.0.0.0/8–255.0.0.0/8 | Future Use | 1981-09 | Reserved for future use (formerly "Class E"). 255.255.255.255 is reserved for "limited broadcast" destination address. |
List of /8 blocks assigned to commercial organizations
| Block | Organization | IANA date | RIR date | Notes |
|---|---|---|---|---|
| 12.0.0.0/8 | AT&T Services | 1995-06 | 1983-08-23 | Originally AT&T Bell Laboratories, but retained by AT&T when Bell Labs was spun off to Lucent Technologies in 1996. Assignment administered by ARIN (Legacy space). |
| 17.0.0.0/8 | Apple Inc. | 1992-07 | 1990-04-16 | Assignment administered by ARIN (Legacy space) |
| 19.0.0.0/8 | Ford Motor Company | 1995-05 | 1988-06-15 | Assignment administered by ARIN (Legacy space) |
| 38.0.0.0/8 | Cogent Communications | 1994-09 | 1991-04-16 | Formerly PSINet. As of 2025, portions of this range are leased to local ISPs. Assignment administered by ARIN (Legacy space) |
| 53.0.0.0/8 | Mercedes-Benz Group AG | 1993-10 | 1970-01-01 | Assignment administered by RIPE (Legacy space) |
| 73.0.0.0/8 | Comcast Corporation | N/A | 2005-04-19 | Assignment administered by ARIN |
List of /8 blocks assigned 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 | DoD Network Information Center | 1995-04 | 1997-11-24 | Formerly IANAReserved 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 /8 blocks assigned to the regional Internet registries
The regional Internet registries (RIRs) 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 IANAreserved 1981-09. | |
| 2.0.0.0/8 | RIPE NCC | 2009-10 | Formerly IANAreserved 1981-09. | |
| 3.0.0.0/8 | ARIN | 1994-05 | Amazon.com. Formerly General Electric Company. | |
| 4.0.0.0/8 | ARIN | 1992-12 | Various registries (maintained by ARIN). Formerly Bolt Beranek and Newman Inc., then GTE, then Genuity, then Level 3 Communications, Inc. | |
| 5.0.0.0/8 | RIPE NCC | 2010-11 | Formerly IANAreserved 1995-07. | |
| 8.0.0.0/8 | ARIN | 1992-12 | 1992-12-01 | Various registries (maintained by ARIN). Formerly Bolt Beranek and Newman Inc., then GTE, then Genuity, then Level 3 Communications, Inc. |
| 9.0.0.0/8 | ARIN | 1992-08 | IBM except for 9.9.9.0/24, which is Quad9. | |
| 13.0.0.0/8 | ARIN | 1991-09 | Various registries (maintained by ARIN). Formerly Xerox. | |
| 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. | |
| 15.0.0.0/8 | ARIN | 1991-09 | Various registries (maintained by ARIN). Formerly Hewlett-Packard Company. HP Inc still uses a portion of the block. | |
| 16.0.0.0/8 | ARIN | 1994-11 | 1989-05-18 | Various registries (maintained by ARIN). Formerly Digital Equipment Corporation, then Compaq, then Hewlett-Packard. |
| 18.0.0.0/8 | ARIN | 1994-01 | Various registries (maintained by ARIN). Formerly MIT. | |
| 20.0.0.0/8 | ARIN | 1994-10 | Various registries (maintained by ARIN). Formerly DXC Technology. Computer Sciences Corporation, who owned this block, merged with HP Enterprise Services to create DXC Technology on 3 April 2017. | |
| 23.0.0.0/8 | ARIN | 2010-11 | Formerly IANAreserved 1995-07. | |
| 24.0.0.0/8 | ARIN | 2001-05 | 2001-05-01 | Formerly IANACable Block 1995-07, then ARINCable Block 2001-05. Updated to ARIN not before 2007. |
| 25.0.0.0/8 | RIPE NCC | 1995-01 | As of 2005-08-23 entire block assigned to UK Ministry of Defence | |
| 27.0.0.0/8 | APNIC | 2010-01 | Formerly IANAreserved 1995-04. | |
| 31.0.0.0/8 | RIPE NCC | 2010-05 | 2010-05-18 | Formerly IANAreserved 1991-04. |
| 32.0.0.0/8 | ARIN | 1994-06 | Various registries (maintained by ARIN). Formerly AT&T Global Network Services. Originally Norsk Informasjonsteknologi (at that time maintained by RIPE NCC). IBM acquired Norsk Informasjonsteknologi (Norway) in 1995. | |
| 34.0.0.0/8 | ARIN | 1993-03 | Various registries (maintained by ARIN). Formerly Halliburton Company. | |
| 35.0.0.0/8 | ARIN | 1994-04 | 2012-08 | Various registries (Maintained by ARIN). Formerly Merit Network 1986. |
| 36.0.0.0/8 | APNIC | 2010-10 | Formerly Stanford University 1993-04, then IANAReserved 2000-07. | |
| 37.0.0.0/8 | RIPE NCC | 2010-11 | Formerly IANAReserved 1995-04. | |
| 39.0.0.0/8 | APNIC | 2011-01 | Formerly IANAReserved 1995-04. | |
| 40.0.0.0/8 | ARIN | 1994-06 | Various registries (Maintained by ARIN). | |
| 41.0.0.0/8 | AFRINIC | 2005-04 | Formerly IANAReserved 1995-05. | |
| 42.0.0.0/8 | APNIC | 2010-10 | Formerly IANAReserved 1995-07. | |
| 43.0.0.0/8 | APNIC | 1991-01 | 1989-02-21 | Various registries (Maintained by APNIC). Originally Japan Inet 1991-01 (IANA date) or 1989-02-21 (RIR date). Administered by APNIC not before 2007. |
| [44.0.0.0/8](44-0-0-0-8) | ARIN | 1992-07 | 2019-07-18 | Various registries (Maintained by ARIN). Originally Amateur Radio Digital Communications. was sold to Amazon on 2019-07-18. |
| 45.0.0.0/8 | ARIN | 1995-01 | 1991-09-09 | Various registries (Maintained by ARIN). 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 became 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 IANAReserved in 2007-04. | |
| 47.0.0.0/8 | ARIN | 1991-01 | Various registries (Maintained by ARIN). Formerly Bell-Northern Research, which became Northern Telecom, aka, Nortel, until its demise, circa 2010. | |
| 48.0.0.0/8 | ARIN | 2023-10-02 | 1990-12-07 | Assignment administered by ARIN (Legacy space). Formerly Prudential Financial, who still use a portion of the space. |
| 49.0.0.0/8 | APNIC | 2010-08 | Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANAReserved in 2007-05. | |
| 50.0.0.0/8 | ARIN | 2010-02 | Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANAReserved in 2007-05. | |
| 51.0.0.0/8 | RIPE NCC | 1994-08 | Various registries (Maintained by RIPE NCC). Formerly UK Government Department for Work and Pensions. | |
| 52.0.0.0/8 | ARIN | 1991-12 | Formerly DuPont. | |
| 54.0.0.0/8 | ARIN | 1992-03 | Various registries (Maintained by ARIN). | |
| 56.0.0.0/8 | ARIN | 1992-11 | Formerly United States Postal Service. | |
| 57.0.0.0/8 | RIPE NCC | 1995-05 | Formerly SITA. | |
| 58.0.0.0/8 | APNIC | 2004-04 | ||
| 59.0.0.0/8 | APNIC | 2004-04 | ||
| 60.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 61.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 62.0.0.0/8 | RIPE NCC | 1997-04 | ||
| 63.0.0.0/8 | ARIN | 1997-04 | ||
| 64.0.0.0/8 | ARIN | 1999-07 | ||
| 65.0.0.0/8 | ARIN | 2000-07 | ||
| 66.0.0.0/8 | ARIN | 2000-07 | ||
| 67.0.0.0/8 | ARIN | 2001-05 | ||
| 68.0.0.0/8 | ARIN | 2001-06 | ||
| 69.0.0.0/8 | ARIN | 2002-08 | ||
| 70.0.0.0/8 | ARIN | 2004-01 | ||
| 71.0.0.0/8 | ARIN | 2004-08 | ||
| 72.0.0.0/8 | ARIN | 2004-08 | ||
| 74.0.0.0/8 | ARIN | 2005-06 | ||
| 75.0.0.0/8 | ARIN | 2005-06 | ||
| 76.0.0.0/8 | ARIN | 2005-06 | ||
| 77.0.0.0/8 | RIPE NCC | 2006-08 | ||
| 78.0.0.0/8 | RIPE NCC | 2006-08 | ||
| 79.0.0.0/8 | RIPE NCC | 2006-08 | ||
| 80.0.0.0/8 | RIPE NCC | 2001-04 | ||
| 81.0.0.0/8 | RIPE NCC | 2001-04 | ||
| 82.0.0.0/8 | RIPE NCC | 2002-11 | ||
| 83.0.0.0/8 | RIPE NCC | 2003-11 | ||
| 84.0.0.0/8 | RIPE NCC | 2003-11 | ||
| 85.0.0.0/8 | RIPE NCC | 2004-04 | ||
| 86.0.0.0/8 | RIPE NCC | 2004-04 | ||
| 87.0.0.0/8 | RIPE NCC | 2004-04 | ||
| 88.0.0.0/8 | RIPE NCC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 89.0.0.0/8 | RIPE NCC | 2005-06 | ||
| 90.0.0.0/8 | RIPE NCC | 2005-06 | Except for 90.0.0.0/9 (the low half of the range), which is Orange | |
| 91.0.0.0/8 | RIPE NCC | 2005-06 | ||
| 92.0.0.0/8 | RIPE NCC | 2007-03 | ||
| 93.0.0.0/8 | ARIN | 1994-05 | ||
| 94.0.0.0/8 | RIPE NCC | 2007-07 | ||
| 95.0.0.0/8 | RIPE NCC | 2007-07 | ||
| 96.0.0.0/8 | ARIN | 2006-10 | ||
| 97.0.0.0/8 | ARIN | 2006-10 | ||
| 98.0.0.0/8 | ARIN | 2006-10 | ||
| 99.0.0.0/8 | ARIN | 2006-10 | ||
| 100.0.0.0/8 | ARIN | 2010-11 | 100.64.0.0/10 reserved for Carrier-grade NAT (detailed in ). | |
| 101.0.0.0/8 | APNIC | 2010-08 | ||
| 102.0.0.0/8 | AFRINIC | 2011-02 | ||
| 103.0.0.0/8 | APNIC | 2011-02 | ||
| 104.0.0.0/8 | ARIN | 2011-02 | ||
| 105.0.0.0/8 | AFRINIC | 2010-11 | ||
| 106.0.0.0/8 | APNIC | 2011-01 | ||
| 107.0.0.0/8 | ARIN | 2010-02 | ||
| 108.0.0.0/8 | ARIN | 2008-12 | ||
| 109.0.0.0/8 | RIPE NCC | 2009-01 | ||
| 110.0.0.0/8 | APNIC | 2008-11 | ||
| 111.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 112.0.0.0/8 | APNIC | 2008-05 | ||
| 113.0.0.0/8 | APNIC | 2008-05 | ||
| 114.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 115.0.0.0/8 | APNIC | 2007-10 | ||
| 116.0.0.0/8 | APNIC | 2007-01 | ||
| 117.0.0.0/8 | APNIC | 2007-01 | ||
| 118.0.0.0/8 | APNIC | 2007-01 | ||
| 119.0.0.0/8 | APNIC | 2007-01 | ||
| 120.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 121.0.0.0/8 | APNIC | 2006-01 | ||
| 122.0.0.0/8 | APNIC | 2006-01 | ||
| 123.0.0.0/8 | APNIC | 2006-01 | ||
| 124.0.0.0/8 | APNIC | 2005-01 | ||
| 125.0.0.0/8 | APNIC | 2005-01 | ||
| 126.0.0.0/8 | APNIC | 2005-01 | SoftBank Group | |
| 128.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). 128.0.0.0 is the start address of formerly "Class B". | |
| 129.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 130.0.0.0/8 | Various registries | |||
| 131.0.0.0/8 | Various registries | |||
| 132.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 133.0.0.0/8 | APNIC | 1997-03 | JPNIC | |
| 134.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 135.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 136.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 137.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 138.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 139.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 140.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 141.0.0.0/8 | RIPE NCC | 1993-05 | Various registries (Maintained by RIPE NCC). | |
| 142.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 143.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 144.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 145.0.0.0/8 | RIPE NCC | 1993-05 | Various registries (Maintained by RIPE NCC). | |
| 146.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 147.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 148.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 149.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 150.0.0.0/8 | APNIC | 1993-05 | Various registries (Maintained by APNIC). | |
| 151.0.0.0/8 | RIPE NCC | 1993-05 | Various registries (Maintained by RIPE NCC). | |
| 152.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 153.0.0.0/8 | APNIC | 1993-05 | Various registries (Maintained by APNIC). | |
| 154.0.0.0/8 | AFRINIC | 1993-05 | Various registries (Maintained by AFRINIC). | |
| 155.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 156.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 157.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 158.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 159.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 160.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 161.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 162.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 163.0.0.0/8 | APNIC | 1993-05 | Various registries (Maintained by APNIC). | |
| 164.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 165.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 166.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 167.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 168.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 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). |
| 170.0.0.0/8 | ARIN | 1993-05 | Various registries (Maintained by ARIN). | |
| 171.0.0.0/8 | APNIC | 1993-05 | Various registries (Maintained by APNIC). | |
| 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). |
| 173.0.0.0/8 | ARIN | 2008-02 | ||
| 174.0.0.0/8 | ARIN | 2008-02 | ||
| 175.0.0.0/8 | APNIC | 2009-08 | ||
| 176.0.0.0/8 | RIPE NCC | 2010-05 | ||
| 177.0.0.0/8 | LACNIC | 2010-06 | ||
| 178.0.0.0/8 | RIPE NCC | 2009-01 | Various registries (Maintained by RIPE NCC). | |
| 179.0.0.0/8 | LACNIC | 2011-02 | ||
| 180.0.0.0/8 | APNIC | 2009-04 | ||
| 181.0.0.0/8 | LACNIC | 2010-06 | ||
| 182.0.0.0/8 | APNIC | 2009-08 | ||
| 183.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 184.0.0.0/8 | ARIN | 2008-12 | ||
| 185.0.0.0/8 | RIPE NCC | 2011-02 | Various registries (Maintained by RIPE NCC). | |
| 186.0.0.0/8 | LACNIC | 2007-09 | ||
| 187.0.0.0/8 | LACNIC | 2007-09 | ||
| 188.0.0.0/8 | RIPE NCC | 1993-05 | Various registries (Maintained by RIPE NCC). | |
| 189.0.0.0/8 | LACNIC | 1995-06 | ||
| 190.0.0.0/8 | LACNIC | 1995-06 | ||
| 191.0.0.0/8 | LACNIC | 1993-05 | Various registries (Maintained by LACNIC). | |
| 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". |
| 193.0.0.0/8 | RIPE NCC | 1993-05 | ||
| 194.0.0.0/8 | RIPE NCC | 1993-05 | ||
| 195.0.0.0/8 | RIPE NCC | 1993-05 | ||
| 196.0.0.0/8 | AFRINIC | 1993-05 | Various registries (Maintained by AFRINIC). | |
| 197.0.0.0/8 | AFRINIC | 2008-10 | ||
| 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). | |
| 199.0.0.0/8 | ARIN | 1993-05 | ||
| 200.0.0.0/8 | LACNIC | 2002-11 | ||
| 201.0.0.0/8 | LACNIC | 2003-04 | ||
| 202.0.0.0/8 | APNIC | 2009-10 | Various registries (Maintained by APNIC). 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). | |
| 204.0.0.0/8 | ARIN | 1994-03 | ||
| 205.0.0.0/8 | ARIN | 1994-03 | ||
| 206.0.0.0/8 | ARIN | 1995-04 | ||
| 207.0.0.0/8 | ARIN | 1995-11 | ||
| 208.0.0.0/8 | ARIN | 1996-04 | ||
| 209.0.0.0/8 | ARIN | 1996-06 | ||
| 210.0.0.0/8 | APNIC | 1996-06 | ||
| 211.0.0.0/8 | APNIC | 1996-06 | ||
| 212.0.0.0/8 | RIPE NCC | 1997-10 | ||
| 213.0.0.0/8 | RIPE NCC | 1993-10 | ||
| 216.0.0.0/8 | ARIN | 1998-04 | ||
| 217.0.0.0/8 | RIPE NCC | 2000-06 | 2002-06-25 | |
| 218.0.0.0/8 | APNIC | 2010-01 | Formerly IANAReserved 1981-09. | |
| 219.0.0.0/8 | APNIC | 2001-09 | ||
| 220.0.0.0/8 | APNIC | 2001-12 | ||
| 221.0.0.0/8 | APNIC | 2002-07 | ||
| 222.0.0.0/8 | APNIC | 2003-02 | ||
| 223.0.0.0/8 | APNIC | 2010-04 |
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 was published in September 1981. In previous versions of the document, network numbers were 8-bit numbers rather than the 32-bit numbers used in IPv4. At that time, three networks were added that were not listed earlier: 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]
Notes
References
- The authoritative up-to-date list of IANA assignments.
- Historical IP address lists:
- First version of IANA table with historical notes via the Internet Archive Wayback Machine.
- Last version of IANA table with historical notes via the Internet Archive Wayback Machine.
References
- "Whois-RWS".
- (September 2023). "Tell HN: Amazon now owns 3.0.0.0/8".
- (24 June 2010). "Public Data Network Numbers". [[Internet Assigned Numbers Authority]].
- (24 May 2016). "CSC Announces Merger with Enterprise Services Segment of Hewlett Packard Enterprise to create a Global IT Services Leader". Press release.
- "New York Stock Exchange {{!}} DXC Technology".
- (11 May 2001). "Network 24 – Cable Block". [[Internet Assigned Numbers Authority]].
- "AMPRNet | Amateur Radio Digital Communications".
- "IPv4 IANA Free Pool Depletion – FAQ". [[American Registry for Internet Numbers]].
- (September 2007). "IPv4 Address Space: 2.46 Billion Down, 1.25 Billion to Go". The Internet Protocol Journal.
- "133.0.0.0/8 Japan Network Information Center Prefix BGP Network Information – BGPView".
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