Saturday, January 14, 2012

IANA IPv4 Address Space Registry


IANA IPv4 Address Space Registry

Last Updated
2011-02-03
Description
The allocation of Internet Protocol version 4 (IPv4) address space to various registries is listed
here. Originally, all the IPv4 address spaces was managed directly by the IANA. Later parts of the
address space were allocated to various other registries to manage for particular purposes or
regional areas of the world. RFC 1466 [RFC1466] documents most of these allocations.
This registry is also available in plain text.
Prefix Designation Date Whois Status [1] Note 
000/8IANA - Local Identification1981-09RESERVED[2]
001/8APNIC2010-01whois.apnic.netALLOCATED
002/8RIPE NCC2009-09whois.ripe.netALLOCATED
003/8General Electric Company1994-05LEGACY
004/8Level 3 Communications, Inc.1992-12LEGACY
005/8RIPE NCC2010-11whois.ripe.netALLOCATED
006/8Army Information Systems Center1994-02LEGACY
007/8Administered by ARIN1995-04whois.arin.netLEGACY
008/8Level 3 Communications, Inc.1992-12LEGACY
009/8IBM1992-08LEGACY
010/8IANA - Private Use1995-06RESERVED[3]
011/8DoD Intel Information Systems1993-05LEGACY
012/8AT&T Bell Laboratories1995-06LEGACY
013/8Xerox Corporation1991-09LEGACY
014/8APNIC2010-04whois.apnic.netALLOCATED[4]
015/8Hewlett-Packard Company1994-07LEGACY
016/8Digital Equipment Corporation1994-11LEGACY
017/8Apple Computer Inc.1992-07LEGACY
018/8MIT1994-01LEGACY
019/8Ford Motor Company1995-05LEGACY
020/8Computer Sciences Corporation1994-10LEGACY
021/8DDN-RVN1991-07LEGACY
022/8Defense Information Systems Agency1993-05LEGACY
023/8ARIN2010-11whois.arin.netALLOCATED
024/8ARIN2001-05whois.arin.netALLOCATED
025/8UK Ministry of Defence1995-01whois.ripe.netLEGACY
026/8Defense Information Systems Agency1995-05LEGACY
027/8APNIC2010-01whois.apnic.netALLOCATED
028/8DSI-North1992-07LEGACY
029/8Defense Information Systems Agency1991-07LEGACY
030/8Defense Information Systems Agency1991-07LEGACY
031/8RIPE NCC2010-05whois.ripe.netALLOCATED
032/8AT&T Global Network Services1994-06LEGACY
033/8DLA Systems Automation Center1991-01LEGACY
034/8Halliburton Company1993-03LEGACY
035/8MERIT Computer Network1994-04LEGACY
036/8APNIC2010-10whois.apnic.netALLOCATED
037/8RIPE NCC2010-11whois.ripe.netALLOCATED
038/8PSINet, Inc.1994-09LEGACY
039/8APNIC2011-01whois.apnic.netALLOCATED
040/8Eli Lily & Company1994-06LEGACY
041/8AfriNIC2005-04whois.afrinic.netALLOCATED
042/8APNIC2010-10whois.apnic.netALLOCATED
043/8Administered by APNIC1991-01LEGACY
044/8Amateur Radio Digital Communications1992-07LEGACY
045/8Administered by ARIN1995-01whois.arin.netLEGACY
046/8RIPE NCC2009-09whois.ripe.netALLOCATED
047/8Bell-Northern Research1991-01LEGACY
048/8Prudential Securities Inc.1995-05LEGACY
049/8APNIC2010-08whois.apnic.netALLOCATED
050/8ARIN2010-02whois.arin.netALLOCATED
051/8UK Government Department for Work and Pensions1994-08whois.ripe.netLEGACY
052/8E.I. duPont de Nemours and Co., Inc.1991-12LEGACY
053/8Cap Debis CCS1993-10LEGACY
054/8Merck and Co., Inc.1992-03LEGACY
055/8DoD Network Information Center1995-04LEGACY
056/8US Postal Service1994-06LEGACY
057/8SITA1995-05LEGACY
058/8APNIC2004-04whois.apnic.netALLOCATED
059/8APNIC2004-04whois.apnic.netALLOCATED
060/8APNIC2003-04whois.apnic.netALLOCATED
061/8APNIC1997-04whois.apnic.netALLOCATED
062/8RIPE NCC1997-04whois.ripe.netALLOCATED
063/8ARIN1997-04whois.arin.netALLOCATED
064/8ARIN1999-07whois.arin.netALLOCATED
065/8ARIN2000-07whois.arin.netALLOCATED
066/8ARIN2000-07whois.arin.netALLOCATED
067/8ARIN2001-05whois.arin.netALLOCATED
068/8ARIN2001-06whois.arin.netALLOCATED
069/8ARIN2002-08whois.arin.netALLOCATED
070/8ARIN2004-01whois.arin.netALLOCATED
071/8ARIN2004-08whois.arin.netALLOCATED
072/8ARIN2004-08whois.arin.netALLOCATED
073/8ARIN2005-03whois.arin.netALLOCATED
074/8ARIN2005-06whois.arin.netALLOCATED
075/8ARIN2005-06whois.arin.netALLOCATED
076/8ARIN2005-06whois.arin.netALLOCATED
077/8RIPE NCC2006-08whois.ripe.netALLOCATED
078/8RIPE NCC2006-08whois.ripe.netALLOCATED
079/8RIPE NCC2006-08whois.ripe.netALLOCATED
080/8RIPE NCC2001-04whois.ripe.netALLOCATED
081/8RIPE NCC2001-04whois.ripe.netALLOCATED
082/8RIPE NCC2002-11whois.ripe.netALLOCATED
083/8RIPE NCC2003-11whois.ripe.netALLOCATED
084/8RIPE NCC2003-11whois.ripe.netALLOCATED
085/8RIPE NCC2004-04whois.ripe.netALLOCATED
086/8RIPE NCC2004-04whois.ripe.netALLOCATED
087/8RIPE NCC2004-04whois.ripe.netALLOCATED
088/8RIPE NCC2004-04whois.ripe.netALLOCATED
089/8RIPE NCC2005-06whois.ripe.netALLOCATED
090/8RIPE NCC2005-06whois.ripe.netALLOCATED
091/8RIPE NCC2005-06whois.ripe.netALLOCATED
092/8RIPE NCC2007-03whois.ripe.netALLOCATED
093/8RIPE NCC2007-03whois.ripe.netALLOCATED
094/8RIPE NCC2007-07whois.ripe.netALLOCATED
095/8RIPE NCC2007-07whois.ripe.netALLOCATED
096/8ARIN2006-10whois.arin.netALLOCATED
097/8ARIN2006-10whois.arin.netALLOCATED
098/8ARIN2006-10whois.arin.netALLOCATED
099/8ARIN2006-10whois.arin.netALLOCATED
100/8ARIN2010-11whois.arin.netALLOCATED
101/8APNIC2010-08whois.apnic.netALLOCATED
102/8AfriNIC2011-02whois.afrinic.netALLOCATED
103/8APNIC2011-02whois.apnic.netALLOCATED
104/8ARIN2011-02whois.arin.netALLOCATED
105/8AfriNIC2010-11whois.afrinic.netALLOCATED
106/8APNIC2011-01whois.apnic.netALLOCATED
107/8ARIN2010-02whois.arin.netALLOCATED
108/8ARIN2008-12whois.arin.netALLOCATED
109/8RIPE NCC2009-01whois.ripe.netALLOCATED
110/8APNIC2008-11whois.apnic.netALLOCATED
111/8APNIC2008-11whois.apnic.netALLOCATED
112/8APNIC2008-05whois.apnic.netALLOCATED
113/8APNIC2008-05whois.apnic.netALLOCATED
114/8APNIC2007-10whois.apnic.netALLOCATED
115/8APNIC2007-10whois.apnic.netALLOCATED
116/8APNIC2007-01whois.apnic.netALLOCATED
117/8APNIC2007-01whois.apnic.netALLOCATED
118/8APNIC2007-01whois.apnic.netALLOCATED
119/8APNIC2007-01whois.apnic.netALLOCATED
120/8APNIC2007-01whois.apnic.netALLOCATED
121/8APNIC2006-01whois.apnic.netALLOCATED
122/8APNIC2006-01whois.apnic.netALLOCATED
123/8APNIC2006-01whois.apnic.netALLOCATED
124/8APNIC2005-01whois.apnic.netALLOCATED
125/8APNIC2005-01whois.apnic.netALLOCATED
126/8APNIC2005-01whois.apnic.netALLOCATED
127/8IANA - Loopback1981-09RESERVED[5]
128/8Administered by ARIN1993-05whois.arin.netLEGACY
129/8Administered by ARIN1993-05whois.arin.netLEGACY
130/8Administered by ARIN1993-05whois.arin.netLEGACY
131/8Administered by ARIN1993-05whois.arin.netLEGACY
132/8Administered by ARIN1993-05whois.arin.netLEGACY
133/8Administered by APNIC1997-03whois.apnic.netLEGACY
134/8Administered by ARIN1993-05whois.arin.netLEGACY
135/8Administered by ARIN1993-05whois.arin.netLEGACY
136/8Administered by ARIN1993-05whois.arin.netLEGACY
137/8Administered by ARIN1993-05whois.arin.netLEGACY
138/8Administered by ARIN1993-05whois.arin.netLEGACY
139/8Administered by ARIN1993-05whois.arin.netLEGACY
140/8Administered by ARIN1993-05whois.arin.netLEGACY
141/8Administered by RIPE NCC1993-05whois.ripe.netLEGACY
142/8Administered by ARIN1993-05whois.arin.netLEGACY
143/8Administered by ARIN1993-05whois.arin.netLEGACY
144/8Administered by ARIN1993-05whois.arin.netLEGACY
145/8Administered by RIPE NCC1993-05whois.ripe.netLEGACY
146/8Administered by ARIN1993-05whois.arin.netLEGACY
147/8Administered by ARIN1993-05whois.arin.netLEGACY
148/8Administered by ARIN1993-05whois.arin.netLEGACY
149/8Administered by ARIN1993-05whois.arin.netLEGACY
150/8Administered by APNIC1993-05whois.apnic.netLEGACY
151/8Administered by RIPE NCC1993-05whois.ripe.netLEGACY
152/8Administered by ARIN1993-05whois.arin.netLEGACY
153/8Administered by APNIC1993-05whois.apnic.netLEGACY
154/8Administered by AfriNIC1993-05whois.afrinic.netLEGACY
155/8Administered by ARIN1993-05whois.arin.netLEGACY
156/8Administered by ARIN1993-05whois.arin.netLEGACY
157/8Administered by ARIN1993-05whois.arin.netLEGACY
158/8Administered by ARIN1993-05whois.arin.netLEGACY
159/8Administered by ARIN1993-05whois.arin.netLEGACY
160/8Administered by ARIN1993-05whois.arin.netLEGACY
161/8Administered by ARIN1993-05whois.arin.netLEGACY
162/8Administered by ARIN1993-05whois.arin.netLEGACY
163/8Administered by APNIC1993-05whois.apnic.netLEGACY
164/8Administered by ARIN1993-05whois.arin.netLEGACY
165/8Administered by ARIN1993-05whois.arin.netLEGACY
166/8Administered by ARIN1993-05whois.arin.netLEGACY
167/8Administered by ARIN1993-05whois.arin.netLEGACY
168/8Administered by ARIN1993-05whois.arin.netLEGACY
169/8Administered by ARIN1993-05whois.arin.netLEGACY[6]
170/8Administered by ARIN1993-05whois.arin.netLEGACY
171/8Administered by APNIC1993-05whois.apnic.netLEGACY
172/8Administered by ARIN1993-05whois.arin.netLEGACY[7]
173/8ARIN2008-02whois.arin.netALLOCATED
174/8ARIN2008-02whois.arin.netALLOCATED
175/8APNIC2009-08whois.apnic.netALLOCATED
176/8RIPE NCC2010-05whois.ripe.netALLOCATED
177/8LACNIC2010-06whois.lacnic.netALLOCATED
178/8RIPE NCC2009-01whois.ripe.netALLOCATED
179/8LACNIC2011-02whois.lacnic.netALLOCATED
180/8APNIC2009-04whois.apnic.netALLOCATED
181/8LACNIC2010-06whois.lacnic.netALLOCATED
182/8APNIC2009-08whois.apnic.netALLOCATED
183/8APNIC2009-04whois.apnic.netALLOCATED
184/8ARIN2008-12whois.arin.netALLOCATED
185/8RIPE NCC2011-02whois.ripe.netALLOCATED
186/8LACNIC2007-09whois.lacnic.netALLOCATED
187/8LACNIC2007-09whois.lacnic.netALLOCATED
188/8Administered by RIPE NCC1993-05whois.ripe.netLEGACY
189/8LACNIC1995-06whois.lacnic.netALLOCATED
190/8LACNIC1995-06whois.lacnic.netALLOCATED
191/8Administered by LACNIC1993-05whois.lacnic.netLEGACY
192/8Administered by ARIN1993-05whois.arin.netLEGACY[8][9]
193/8RIPE NCC1993-05whois.ripe.netALLOCATED
194/8RIPE NCC1993-05whois.ripe.netALLOCATED
195/8RIPE NCC1993-05whois.ripe.netALLOCATED
196/8Administered by AfriNIC1993-05whois.afrinic.netLEGACY
197/8AfriNIC2008-10whois.afrinic.netALLOCATED
198/8Administered by ARIN1993-05whois.arin.netLEGACY[10]
199/8ARIN1993-05whois.arin.netALLOCATED
200/8LACNIC2002-11whois.lacnic.netALLOCATED
201/8LACNIC2003-04whois.lacnic.netALLOCATED
202/8APNIC1993-05whois.apnic.netALLOCATED
203/8APNIC1993-05whois.apnic.netALLOCATED[11]
204/8ARIN1994-03whois.arin.netALLOCATED
205/8ARIN1994-03whois.arin.netALLOCATED
206/8ARIN1995-04whois.arin.netALLOCATED
207/8ARIN1995-11whois.arin.netALLOCATED
208/8ARIN1996-04whois.arin.netALLOCATED
209/8ARIN1996-06whois.arin.netALLOCATED
210/8APNIC1996-06whois.apnic.netALLOCATED
211/8APNIC1996-06whois.apnic.netALLOCATED
212/8RIPE NCC1997-10whois.ripe.netALLOCATED
213/8RIPE NCC1993-10whois.ripe.netALLOCATED
214/8US-DOD1998-03LEGACY
215/8US-DOD1998-03LEGACY
216/8ARIN1998-04whois.arin.netALLOCATED
217/8RIPE NCC2000-06whois.ripe.netALLOCATED
218/8APNIC2000-12whois.apnic.netALLOCATED
219/8APNIC2001-09whois.apnic.netALLOCATED
220/8APNIC2001-12whois.apnic.netALLOCATED
221/8APNIC2002-07whois.apnic.netALLOCATED
222/8APNIC2003-02whois.apnic.netALLOCATED
223/8APNIC2010-04whois.apnic.netALLOCATED
224/8Multicast1981-09RESERVED[12]
225/8Multicast1981-09RESERVED[12]
226/8Multicast1981-09RESERVED[12]
227/8Multicast1981-09RESERVED[12]
228/8Multicast1981-09RESERVED[12]
229/8Multicast1981-09RESERVED[12]
230/8Multicast1981-09RESERVED[12]
231/8Multicast1981-09RESERVED[12]
232/8Multicast1981-09RESERVED[12]
233/8Multicast1981-09RESERVED[12]
234/8Multicast1981-09RESERVED[12][13]
235/8Multicast1981-09RESERVED[12]
236/8Multicast1981-09RESERVED[12]
237/8Multicast1981-09RESERVED[12]
238/8Multicast1981-09RESERVED[12]
239/8Multicast1981-09RESERVED[12][14]
240/8Future use1981-09RESERVED[15]
241/8Future use1981-09RESERVED[15]
242/8Future use1981-09RESERVED[15]
243/8Future use1981-09RESERVED[15]
244/8Future use1981-09RESERVED[15]
245/8Future use1981-09RESERVED[15]
246/8Future use1981-09RESERVED[15]
247/8Future use1981-09RESERVED[15]
248/8Future use1981-09RESERVED[15]
249/8Future use1981-09RESERVED[15]
250/8Future use1981-09RESERVED[15]
251/8Future use1981-09RESERVED[15]
252/8Future use1981-09RESERVED[15]
253/8Future use1981-09RESERVED[15]
254/8Future use1981-09RESERVED[15]
255/8Future use1981-09RESERVED[15][16]

Footnotes

[1]
Indicates the status of address blocks as follows:
RESERVED: designated by the IETF for specific non-unicast purposes as noted.
LEGACY: allocated by the central Internet Registry (IR) prior to the Regional Internet Registries
(RIRs). This address space is now administered by individual RIRs as noted, including maintenance
of WHOIS Directory and reverse DNS records. Assignments from these blocks are distributed globally
on a regional basis.
ALLOCATED: delegated entirely to specific RIR as indicated.
UNALLOCATED: not yet allocated or reserved.
[2]
0.0.0.0/8 reserved for self-identification [RFC5735]
[3]
Reserved for Private-Use Networks [RFC1918]
[4]
This was reserved for Public Data Networks [RFC1356]
See: http://www.iana.org/assignments/public-data-network-numbers
It was recovered in February 2008 and was subsequently allocated to APNIC in April 2010
[5]
127.0.0.0/8 is reserved for Loopback [RFC5735]
[6]
169.254.0.0/16 reserved for Link Local [RFC5735]
[7]
172.16.0.0/12 reserved for Private-Use Networks [RFC1918]
[8]
192.0.2.0/24  reserved for TEST-NET-1 [RFC5737]
192.88.99.0/24 reserved for 6to4 Relay Anycast [RFC3068]
192.168.0.0/16 reserved for Private-Use Networks [RFC1918]
[9]
192.0.0.0/24 reserved for IANA IPv4 Special Purpose Address Registry [RFC5736]
[10]
198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing [RFC5735]
198.51.100.0/24 reserved for TEST-NET-2 [RFC5737]
[11]
203.0.113.0/24 reserved for TEST-NET-3 [RFC5737]
[12]
Multicast (formerly "Class D") [RFC5771] registed in http://www.iana.org/assignments/multicast-addresses
[13]
Unicast-Prefix-Based IPv4 Multicast Addresses [RFC6034]
[14]
Administratively Scoped IP Multicast [RFC2365]
[15]
Reserved for future use (formerly "Class E") [RFC1112]
[16]
255.255.255.255 is reserved for "limited broadcast" destination address [RFC0919] and [RFC0922]
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