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.

Contents

Each /8 block contains 2563 = 224 = 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 36.0.0.0/8, have returned their allocated blocks (in this case to APNIC) to assist in the delay of the exhaustion date.

List of reserved /8 blocks

BlockOrganization IANA date RIR dateNotes
0.0.0.0/8 IANA  Local Identification1981-09Originally IANA Reserved 1981-09. 0.0.0.0/8 reserved for self-identification. [1]
10.0.0.0/8IANA Private Use1995-06Reserved for Private Networks. [2] Formerly ARPANET. [3]
127.0.0.0/8 IANA  Loopback1981-09127.0.0.0/8 is reserved for loopback. [1]
224.0.0.0/8–239.0.0.0/8 Multicast 1981-091991-05-22 Multicast (formerly "Class D" [4] ) registered in .
240.0.0.0/8–255.0.0.0/8Future Use1981-09Reserved for future use (formerly "Class E" [5] ). 255.255.255.255 is reserved for "limited broadcast" destination address. [6] [7]

List of assigned /8 blocks to commercial organisations

BlockOrganization IANA date RIR dateNotes
12.0.0.0/8 AT&T Services 1995-061983-08-23Originally 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. 1992-071990-04-16Assignment administered by ARIN (Legacy space)
19.0.0.0/8 Ford Motor Company 1995-051988-06-15Assignment administered by ARIN (Legacy space)
38.0.0.0/8 Cogent Communications 1994-091991-04-16Formerly PSINet. Assignment administered by ARIN (Legacy space)
53.0.0.0/8 Mercedes-Benz Group AG 1993-101970-01-01Assignment administered by RIPE (Legacy space)
73.0.0.0/8 Comcast Corporation [8] N/A2005-04-19Assignment administered by ARIN.

List of assigned /8 blocks to the United States Department of Defense

BlockOrganization IANA date RIR dateNotes
6.0.0.0/8 Army Information Systems Center 1994-021994-02-01Headquarters, USAISC
7.0.0.0/8 DoD Network Information Center 1995-041997-11-24Formerly 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 Systems1993-051984-01-19
21.0.0.0/8 DDN-RVN 1991-071991-07-01DoD Network Information Center (DNIC)
22.0.0.0/8 Defense Information Systems Agency 1993-051989-06-26DoD Network Information Center (DNIC)
26.0.0.0/8 Defense Information Systems Agency 1995-051995-05-01DoD Network Information Center (DNIC)
28.0.0.0/8 DSI-North 1992-07DoD Network Information Center (DNIC)
29.0.0.0/8 Defense Information Systems Agency 1991-071991-07-01DoD Network Information Center (DNIC)
30.0.0.0/8 Defense Information Systems Agency 1991-071991-07-01DoD Network Information Center (DNIC)
33.0.0.0/8 DLA Systems Automation Center 1991-011991-01-01DoD Network Information Center (DNIC)
55.0.0.0/8 DoD Network Information Center 1995-041996-10-26Headquarters, USAISC. Formerly Boeing Computer Services 1995-04.
Updated to DoD Network Information Center in 2007-02.
214.0.0.0/8US-DOD1998-031998-03-27DoD Network Information Center (DNIC)
215.0.0.0/8US-DOD1998-031998-06-05DoD Network Information Center (DNIC)

List of assigned /8 blocks to the regional Internet registries

Map of regional Internet registries Regional Internet Registries world map.svg
Map of regional Internet registries

The regional Internet registries (RIRs) allocate IPs within a particular region of the world.

BlockOrganization IANA date RIR dateNotes
1.0.0.0/8 APNIC 2010-01Formerly IANA - reserved 1981-09.
2.0.0.0/8 RIPE NCC 2009-10Formerly IANA - reserved 1981-09.
3.0.0.0/8 ARIN 1994-05 Amazon.com. [9] Formerly General Electric Company.
4.0.0.0/8 ARIN 1992-12Various 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 2010-11Formerly IANA - reserved 1995-07.
8.0.0.0/8 ARIN 1992-121992-12-01Various 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 1991-09Various registries (maintained by ARIN). Formerly Xerox.
14.0.0.0/8 APNIC 2010-04Starting 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. [10]
15.0.0.0/8 ARIN 1991-09Various registries (maintained by ARIN). Formerly Hewlett-Packard Company. HP Inc still uses a portion of the block.
16.0.0.0/8 ARIN 1994-111989-05-18Various registries (maintained by ARIN). Formerly Digital Equipment Corporation, then Compaq, then Hewlett-Packard.
18.0.0.0/8 ARIN 1994-01Various registries (maintained by ARIN). Formerly MIT.
20.0.0.0/8 ARIN 1994-10Various 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. [11] [12]
23.0.0.0/8 ARIN 2010-11Formerly IANA - reserved 1995-07.
24.0.0.0/8 ARIN 2001-052001-05-01Formerly IANA - Cable Block 1995-07, then ARIN - Cable Block 2001-05. [13] Updated to ARIN not before 2007.
25.0.0.0/8 RIPE NCC 1995-01As of 2005-08-23 entire block assigned to UK Ministry of Defence
27.0.0.0/8 APNIC 2010-01Formerly IANA - reserved 1995-04.
31.0.0.0/8 RIPE NCC 2010-052010-05-18Formerly IANA - reserved 1991-04.
32.0.0.0/8 ARIN 1994-06Various 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 1993-03Various registries (maintained by ARIN). Formerly Halliburton Company.
35.0.0.0/8 ARIN 1994-042012-08Various registries (Maintained by ARIN). Formerly Merit Network 1986.
36.0.0.0/8 APNIC 2010-10Formerly Stanford University 1993-04, then IANA - Reserved 2000-07.
37.0.0.0/8 RIPE NCC 2010-11Formerly IANA - Reserved 1995-04.
39.0.0.0/8 APNIC 2011-01Formerly IANA - Reserved 1995-04.
40.0.0.0/8 ARIN 1994-06Various registries (Maintained by ARIN).
41.0.0.0/8 AFRINIC 2005-04Formerly IANA - Reserved 1995-05.
42.0.0.0/8 APNIC 2010-10Formerly IANA - Reserved 1995-07.
43.0.0.0/8 APNIC 1991-011989-02-21Various 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 ARIN 1992-072019-07-18Various registries (Maintained by ARIN). Originally Amateur Radio Digital Communications. 44.192.0.0/10 was sold to Amazon on 2019-07-18. [14]
45.0.0.0/8 ARIN 1995-011991-09-09Various 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). [15]
46.0.0.0/8 RIPE NCC 2009-09Formerly Bolt Beranek and Newman Inc. 1992-12. Returned to IANA in 2007-04. [16] Updated to IANA - Reserved in 2007-04.
47.0.0.0/8 ARIN 1991-01Various 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 2023-10-021990-12-07Assignment administered by ARIN (Legacy space). Formerly Prudential Financial, who still use a portion of the space.
49.0.0.0/8 APNIC 2010-08Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05.
50.0.0.0/8 ARIN 2010-02Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05.
51.0.0.0/8 RIPE NCC 1994-08Various registries (Maintained by RIPE NCC). Formerly UK Government Department for Work and Pensions.
52.0.0.0/8 ARIN 1991-12Formerly DuPont.
54.0.0.0/8 ARIN 1992-03Various registries (Maintained by ARIN).
56.0.0.0/8 ARIN 1992-11Formerly United States Postal Service.
57.0.0.0/8 RIPE NCC 1995-05Formerly SITA.
58.0.0.0/8 APNIC 2004-04
59.0.0.0/8 APNIC 2004-04
60.0.0.0/8 APNIC 2010-01Formerly IANA - Reserved 1981-09.
61.0.0.0/8 APNIC 2010-01Formerly IANA - Reserved 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 2010-01Formerly IANA - Reserved 1981-09.
89.0.0.0/8 RIPE NCC 2005-06
90.0.0.0/8 RIPE NCC 2005-06Except for 90.0.0.0/9, 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 RIPE NCC 2007-03
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 2010-11100.64.0.0/10 reserved for Carrier-grade NAT (detailed in RFC   6598).
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 2010-01Formerly IANA - Reserved 1981-09.
112.0.0.0/8 APNIC 2008-05
113.0.0.0/8 APNIC 2008-05
114.0.0.0/8 APNIC 2010-01Formerly IANA - Reserved 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 2010-01Formerly IANA - Reserved 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 2005-01SOFTBANK Corp.
128.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN). 128.0.0.0 is the start address of formerly "Class B".
129.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
130.0.0.0/8Various registries
131.0.0.0/8Various registries
132.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
133.0.0.0/8 APNIC 1997-03 JPNIC [17]
134.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
135.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
136.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
137.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
138.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
139.0.0.0/8MIXVarious registries
140.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
141.0.0.0/8 RIPE NCC 1993-05Various registries (Maintained by RIPE NCC).
142.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
143.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
144.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
145.0.0.0/8 RIPE NCC 1993-05Various registries (Maintained by RIPE NCC).
146.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
147.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
148.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
149.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
150.0.0.0/8 APNIC 1993-05Various registries (Maintained by APNIC).
151.0.0.0/8 RIPE NCC 1993-05Various registries (Maintained by RIPE NCC).
152.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
153.0.0.0/8 APNIC 1993-05Various registries (Maintained by APNIC).
154.0.0.0/8 AFRINIC 1993-05Various registries (Maintained by AFRINIC).
155.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
156.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
157.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
158.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
159.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
160.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
161.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
162.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
163.0.0.0/8 APNIC 1993-05Various registries (Maintained by APNIC).
164.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
165.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
166.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
167.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
168.0.0.0/8 ARIN 1993-05Various registries (Maintained by ARIN).
169.0.0.0/8 ARIN 1993-051993-05-01Various 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 1993-05Various registries (Maintained by ARIN).
171.0.0.0/8 APNIC 1993-05Various registries (Maintained by APNIC).
172.0.0.0/8 ARIN 1993-051993-05-01Various 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 2009-01Various 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 2010-01Formerly IANA - Reserved 1981-09.
184.0.0.0/8 ARIN 2008-12
185.0.0.0/8 RIPE NCC 2011-02Various 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 1993-05Various 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 1993-05Various registries (Maintained by LACNIC).
192.0.0.0/8 ARIN 1993-051993-05-01Various 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 1993-05Various registries (Maintained by AFRINIC).
197.0.0.0/8 AFRINIC 2008-10
198.0.0.0/8 ARIN 1993-05Various 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 2009-10Various registries (Maintained by APNIC). 202.123.0.0/19 transferred to AFRINIC
203.0.0.0/8 APNIC 1993-05203.0.113.0/24 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 2000-062002-06-25
218.0.0.0/8 APNIC 2010-01Formerly IANA - Reserved 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. [3] In previous versions of the document, [18] [19] 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 ]

See also

Notes

  1. 1 2 M. Cotton; L. Vegoda; B. Haberman (April 2013). R. Bonica (ed.). Special-Purpose IP Address Registries. IETF. doi: 10.17487/RFC6890 . ISSN   2070-1721. BCP 153. RFC 6890.Best Common Practice. Obsoletes RFC  4773, 5156, 5735 and 5736. Updated by RFC  8190.
  2. Y. Rekhter; B. Moskowitz; D. Karrenberg; G. J. de Groot; E. Lear (February 1996). Address Allocation for Private Internets. Network Working Group. doi: 10.17487/RFC1918 . BCP 5. RFC 1918.Best Common Practice. Obsoletes RFC  1627 and 1597. Updated by RFC  6761.
  3. 1 2 J. Postel (September 1981). ASSIGNED NUMBERS. Network Working Group. doi: 10.17487/RFC0790 . RFC 790.Obsolete. Obsoleted by RFC  820. Obsoletes RFC  776, 770, 762, 758, 755, 750, 739, 604, 503, 433 and 349.Obsoletes IENs: 127, 117, 93.
  4. M. Cotton; L. Vegoda; D. Meyer (March 2010). IANA Guidelines for IPv4 Multicast Address Assignments. IETF. doi: 10.17487/RFC5771 . ISSN   2070-1721. BCP 51. RFC 5771.Best Common Practice. Obsoletes RFC  3138 and 3171. Updates RFC  2780.
  5. S. Deering (August 1989). Host Extensions for IP Multicasting. Network Working Group. doi: 10.17487/RFC1112 . STD 5. RFC 1112.Internet Standard 5. Obsoletes RFC  988 and 1054. Updated by RFC  2236.
  6. J. Mogul (October 1984). BROADCASTING INTERNET DATAGRAMS. Network Working Group. doi: 10.17487/RFC0919 . STD 5. RFC 919.Internet Standard 5.
  7. J. Mogul (October 1984). BROADCASTING INTERNET DATAGRAMS IN THE PRESENCE OF SUBNETS. Network Working Group. doi: 10.17487/RFC0922 . STD 5. RFC 922.Internet Standard 5.
  8. "Whois-RWS".
  9. "Tell HN: Amazon now owns 3.0.0.0/8". Hacker News.[ self-published source ]
  10. "Public Data Network Numbers". Internet Assigned Numbers Authority. 24 June 2010. Retrieved 27 March 2011.
  11. "CSC Announces Merger with Enterprise Services Segment of Hewlett Packard Enterprise to create a Global IT Services Leader". Press release. 24 May 2016. Retrieved 4 November 2016.
  12. "New York Stock Exchange | DXC Technology". www.nyse.com. Archived from the original on 6 April 2017.
  13. "Network 24 - Cable Block". Internet Assigned Numbers Authority. 11 May 2001. Archived from the original on 27 June 2011. Retrieved 27 March 2011.
  14. "AMPRNet | Amateur Radio Digital Communications".
  15. "IPv4 IANA Free Pool Depletion – FAQ". American Registry for Internet Numbers. Archived from the original on 28 June 2011. Retrieved 27 March 2011.
  16. van Beijnum, Iljitsch (September 2007). "IPv4 Address Space: 2.46 Billion Down, 1.25 Billion to Go" (PDF). The Internet Protocol Journal. 10 (3): 22–28. ISSN   1944-1134 . Retrieved 20 April 2024.
  17. "133.0.0.0/8 Japan Network Information Center Prefix BGP Network Information - BGPView". bgpview.io. Retrieved 25 January 2022.
  18. J. Postel (January 1981). ASSIGNED NUMBERS. IETF. doi: 10.17487/RFC0776 . RFC 776.Obsolete. Obsoleted by RFC  790. Obsoletes RFC  770 and IEN 127.
  19. J. Postel (January 1981). ASSIGNED NUMBERS. IETF. doi: 10.17487/RFC0750 . RFC 750.Obsolete. Obsoleted by RFC  755. Obsoletes RFC  739.

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An Internet Protocol address is a numerical label such as 192.0.2.1 that is assigned to a device connected to a computer network that uses the Internet Protocol for communication. IP addresses serve two main functions: network interface identification, and location addressing.

<span class="mw-page-title-main">IPv4</span> Fourth version of the Internet Protocol

Internet Protocol version 4 (IPv4) is the first version of the Internet Protocol (IP) as a standalone specification. It is one of the core protocols of standards-based internetworking methods in the Internet and other packet-switched networks. IPv4 was the first version deployed for production on SATNET in 1982 and on the ARPANET in January 1983. It is still used to route most Internet traffic today, even with the ongoing deployment of Internet Protocol version 6 (IPv6), its successor.

<span class="mw-page-title-main">IPv6</span> Version 6 of the Internet Protocol

Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated problem of IPv4 address exhaustion, and was intended to replace IPv4. In December 1998, IPv6 became a Draft Standard for the IETF, which subsequently ratified it as an Internet Standard on 14 July 2017.

A multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service. Multicast addressing can be used in the link layer, such as Ethernet multicast, and at the internet layer for Internet Protocol Version 4 (IPv4) or Version 6 (IPv6) multicast.

<span class="mw-page-title-main">Internet Assigned Numbers Authority</span> Standards organization overseeing IP addresses

The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet Protocol–related symbols and Internet numbers.

<span class="mw-page-title-main">Classful network</span> Early system for organizing the IPv4 address space

A classful network is an obsolete network addressing architecture used in the Internet from 1981 until the introduction of Classless Inter-Domain Routing (CIDR) in 1993. The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits. Classes A, B, and C provide unicast addresses for networks of three different network sizes. Class D is for multicast networking and the class E address range is reserved for future or experimental purposes.

Bogon filtering is the practice of filtering bogons, which are bogus (fake) IP addresses of a computer network. Bogons include IP packets on the public Internet that contain addresses that are not in any range allocated or delegated by the Internet Assigned Numbers Authority (IANA) or a delegated regional Internet registry (RIR) and allowed for public Internet use. The areas of unallocated address space are called the bogon space.

An autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators on behalf of a single administrative entity or domain, that presents a common and clearly defined routing policy to the Internet. Each AS is assigned an autonomous system number (ASN), for use in Border Gateway Protocol (BGP) routing. Autonomous System Numbers are assigned to Local Internet Registries (LIRs) and end-user organizations by their respective Regional Internet Registries (RIRs), which in turn receive blocks of ASNs for reassignment from the Internet Assigned Numbers Authority (IANA). The IANA also maintains a registry of ASNs which are reserved for private use.

A Martian packet is an IP packet seen on the public Internet that contains a source or destination address that is reserved for special use by the Internet Assigned Numbers Authority (IANA) as defined in RFC 1812, Appendix B Glossary. On the public Internet, such a packet either has a spoofed source address, and it cannot actually originate as claimed, or the packet cannot be delivered. The requirement to filter these packets is found in RFC 1812, Section 5.3.7.

In computer networking, localhost is a hostname that refers to the current computer used to access it. The name localhost is reserved for loopback purposes. It is used to access the network services that are running on the host via the loopback network interface. Using the loopback interface bypasses any local network interface hardware.

In Internet networking, a private network is a computer network that uses a private address space of IP addresses. These addresses are commonly used for local area networks (LANs) in residential, office, and enterprise environments. Both the IPv4 and the IPv6 specifications define private IP address ranges.

In the Internet addressing architecture, the Internet Engineering Task Force (IETF) and the Internet Assigned Numbers Authority (IANA) have reserved various Internet Protocol (IP) addresses for special purposes.

In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system, a port is a logical construct that identifies a specific process or a type of network service. A port at the software level is identified for each transport protocol and address combination by the port number assigned to it. The most common transport protocols that use port numbers are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP); those port numbers are 16-bit unsigned numbers.

<span class="mw-page-title-main">IPv4 address exhaustion</span> Depletion of unallocated IPv4 addresses

IPv4 address exhaustion is the depletion of the pool of unallocated IPv4 addresses. Because the original Internet architecture had fewer than 4.3 billion addresses available, depletion has been anticipated since the late 1980s when the Internet started experiencing dramatic growth. This depletion is one of the reasons for the development and deployment of its successor protocol, IPv6. IPv4 and IPv6 coexist on the Internet.

In computer networking, a link-local address is a network address that is valid only for communications on a local link, i.e. within a subnetwork that a host is connected to. Link-local addresses are most often unicast network addresses assigned automatically through a process known as stateless address autoconfiguration (SLAAC) or link-local address autoconfiguration, also known as automatic private IP addressing (APIPA) or auto-IP. Link-local addresses are not all unicast; e.g. IPv6 addresses beginning with ff02:, and IPv4 addresses beginning with 224.0.0. are multicast addresses that are link-local.

A unique local address (ULA) is an Internet Protocol version 6 (IPv6) address in the address range fc00::/7. These addresses are non-globally reachable. For this reason, ULAs are somewhat analogous to IPv4 private network addressing, but with significant differences. Unique local addresses may be used freely, without centralized registration, inside a single site or organization or spanning a limited number of sites or organizations.

The Internet Protocol Version 4 address 0.0.0.0 can have multiple uses.

<span class="mw-page-title-main">IPv6 address</span> Label to identify a network interface of a computer or other network node

An Internet Protocol version 6 address is a numeric label that is used to identify and locate a network interface of a computer or a network node participating in a computer network using IPv6. IP addresses are included in the packet header to indicate the source and the destination of each packet. The IP address of the destination is used to make decisions about routing IP packets to other networks.

An IPv6 packet is the smallest message entity exchanged using Internet Protocol version 6 (IPv6). Packets consist of control information for addressing and routing and a payload of user data. The control information in IPv6 packets is subdivided into a mandatory fixed header and optional extension headers. The payload of an IPv6 packet is typically a datagram or segment of the higher-level transport layer protocol, but may be data for an internet layer or link layer instead.

In order to ensure proper working of carrier-grade NAT (CGN), and, by doing so, alleviating the demand for the last remaining IPv4 addresses, a /10 size IPv4 address block was assigned by Internet Assigned Numbers Authority (IANA) to be used as shared address space. This block of addresses is specifically meant to be used by Internet service providers that implement carrier-grade NAT, to connect their customer-premises equipment (CPE) to their core routers.

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