IPv4 Global Unicast Address Assignments

(last updated 2008-05-27)

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.


Prefix  Designation                          Date      Whois               Status [1]         Note
-----   ------                               ----      -----               ----------         ----

000/8   IANA - Local Identification          1981-09                       RESERVED           [2]
001/8   IANA                                                               UNALLOCATED        
002/8   IANA                                                               UNALLOCATED        
003/8   General Electric Company             1994-05                       LEGACY             
004/8   Level 3 Communications, Inc.         1992-12                       LEGACY             
005/8   IANA                                                               UNALLOCATED        
006/8   Army Information Systems Center      1994-02                       LEGACY             
007/8   Administered by ARIN                 1995-04   whois.arin.net      LEGACY        
008/8   Level 3 Communications, Inc.         1992-12                       LEGACY             
009/8   IBM                                  1992-08                       LEGACY             
010/8   IANA - Private Use                   1995-06                       RESERVED           [3]
011/8   DoD Intel Information Systems        1993-05                       LEGACY             
012/8   AT&T Bell Laboratories               1995-06                       LEGACY             
013/8   Xerox Corporation                    1991-09                       LEGACY             
014/8   IANA                                                               UNALLOCATED        [4]
015/8   Hewlett-Packard Company              1994-07                       LEGACY             
016/8   Digital Equipment Corporation        1994-11                       LEGACY             
017/8   Apple Computer Inc.                  1992-07                       LEGACY             
018/8   MIT                                  1994-01                       LEGACY             
019/8   Ford Motor Company                   1995-05                       LEGACY             
020/8   Computer Sciences Corporation        1994-10                       LEGACY             
021/8   DDN-RVN                              1991-07                       LEGACY             
022/8   Defense Information Systems Agency   1993-05                       LEGACY             
023/8   IANA                                                               UNALLOCATED        
024/8   ARIN                                 2001-05   whois.arin.net      ALLOCATED          
025/8   UK Ministry of Defence               1995-01                       LEGACY                 
026/8   Defense Information Systems Agency   1995-05                       LEGACY             
027/8   IANA                                                               UNALLOCATED        
028/8   DSI-North                            1992-07                       LEGACY             
029/8   Defense Information Systems Agency   1991-07                       LEGACY             
030/8   Defense Information Systems Agency   1991-07                       LEGACY             
031/8   IANA                                                               UNALLOCATED        
032/8   AT&T Global Network Services         1994-06                       LEGACY             
033/8   DLA Systems Automation Center        1991-01                       LEGACY             
034/8   Halliburton Company                  1993-03                       LEGACY             
035/8   MERIT Computer Network               1994-04                       LEGACY             
036/8   IANA                                                               UNALLOCATED        
037/8   IANA                                                               UNALLOCATED        
038/8   Performance Systems International    1994-09                       LEGACY             
039/8   IANA                                                               UNALLOCATED        
040/8   Eli Lily & Company                   1994-06                       LEGACY             
041/8   AfriNIC                              2005-04   whois.afrinic.net   ALLOCATED          
042/8   IANA                                                               UNALLOCATED        
043/8   Japan Inet                           1991-01                       LEGACY              
044/8   Amateur Radio Digital Communications 1992-07                       LEGACY             
045/8   Interop Show Network                 1995-01                       LEGACY             
046/8   IANA                                                               UNALLOCATED                
047/8   Bell-Northern Research               1991-01                       LEGACY             
048/8   Prudential Securities Inc.           1995-05                       LEGACY             
049/8   IANA                                                               UNALLOCATED              
050/8   IANA                                                               UNALLOCATED              
051/8   Deparment of Social Security of UK   1994-08                       LEGACY              
052/8   E.I. duPont de Nemours and Co., Inc. 1991-12                       LEGACY             
053/8   Cap Debis CCS                        1993-10                       LEGACY             
054/8   Merck and Co., Inc.                  1992-03                       LEGACY             
055/8   DoD Network Information Center       1995-04                       LEGACY             
056/8   US Postal Service                    1994-06                       LEGACY             
057/8   SITA                                 1995-05                       LEGACY             
058/8   APNIC                                2004-04   whois.apnic.net     ALLOCATED          
059/8   APNIC                                2004-04   whois.apnic.net     ALLOCATED          
060/8   APNIC                                2003-04   whois.apnic.net     ALLOCATED          
061/8   APNIC                                1997-04   whois.apnic.net     ALLOCATED          
062/8   RIPE NCC                             1997-04   whois.ripe.net      ALLOCATED          
063/8   ARIN                                 1997-04   whois.arin.net      ALLOCATED          
064/8   ARIN                                 1999-07   whois.arin.net      ALLOCATED          
065/8   ARIN                                 2000-07   whois.arin.net      ALLOCATED          
066/8   ARIN                                 2000-07   whois.arin.net      ALLOCATED          
067/8   ARIN                                 2001-05   whois.arin.net      ALLOCATED          
068/8   ARIN                                 2001-06   whois.arin.net      ALLOCATED          
069/8   ARIN                                 2002-08   whois.arin.net      ALLOCATED          
070/8   ARIN                                 2004-01   whois.arin.net      ALLOCATED          
071/8   ARIN                                 2004-08   whois.arin.net      ALLOCATED          
072/8   ARIN                                 2004-08   whois.arin.net      ALLOCATED          
073/8   ARIN                                 2005-03   whois.arin.net      ALLOCATED          
074/8   ARIN                                 2005-06   whois.arin.net      ALLOCATED          
075/8   ARIN                                 2005-06   whois.arin.net      ALLOCATED          
076/8   ARIN                                 2005-06   whois.arin.net      ALLOCATED          
077/8   RIPE NCC                             2006-08   whois.ripe.net      ALLOCATED          
078/8   RIPE NCC                             2006-08   whois.ripe.net      ALLOCATED          
079/8   RIPE NCC                             2006-08   whois.ripe.net      ALLOCATED          
080/8   RIPE NCC                             2001-04   whois.ripe.net      ALLOCATED          
081/8   RIPE NCC                             2001-04   whois.ripe.net      ALLOCATED          
082/8   RIPE NCC                             2002-11   whois.ripe.net      ALLOCATED          
083/8   RIPE NCC                             2003-11   whois.ripe.net      ALLOCATED          
084/8   RIPE NCC                             2003-11   whois.ripe.net      ALLOCATED          
085/8   RIPE NCC                             2004-04   whois.ripe.net      ALLOCATED          
086/8   RIPE NCC                             2004-04   whois.ripe.net      ALLOCATED          
087/8   RIPE NCC                             2004-04   whois.ripe.net      ALLOCATED          
088/8   RIPE NCC                             2004-04   whois.ripe.net      ALLOCATED          
089/8   RIPE NCC                             2005-06   whois.ripe.net      ALLOCATED          
090/8   RIPE NCC                             2005-06   whois.ripe.net      ALLOCATED          
091/8   RIPE NCC                             2005-06   whois.ripe.net      ALLOCATED          
092/8   RIPE NCC                             2007-03   whois.ripe.net      ALLOCATED        
093/8   RIPE NCC                             2007-03   whois.ripe.net      ALLOCATED        
094/8   RIPE NCC                             2007-07   whois.ripe.net      ALLOCATED        
095/8   RIPE NCC                             2007-07   whois.ripe.net      ALLOCATED        
096/8   ARIN                                 2006-10   whois.arin.net      ALLOCATED          
097/8   ARIN                                 2006-10   whois.arin.net      ALLOCATED          
098/8   ARIN                                 2006-10   whois.arin.net      ALLOCATED          
099/8   ARIN                                 2006-10   whois.arin.net      ALLOCATED          
100/8   IANA                                                               UNALLOCATED        
101/8   IANA                                                               UNALLOCATED        
102/8   IANA                                                               UNALLOCATED        
103/8   IANA                                                               UNALLOCATED        
104/8   IANA                                                               UNALLOCATED        
105/8   IANA                                                               UNALLOCATED        
106/8   IANA                                                               UNALLOCATED        
107/8   IANA                                                               UNALLOCATED        
108/8   IANA                                                               UNALLOCATED        
109/8   IANA                                                               UNALLOCATED        
110/8   IANA                                                               UNALLOCATED        
111/8   IANA                                                               UNALLOCATED        
112/8   APNIC                                2008-05   whois.apnic.net     ALLOCATED        
113/8   APNIC                                2008-05   whois.apnic.net     ALLOCATED     
114/8   APNIC                                2007-10   whois.apnic.net     ALLOCATED        
115/8   APNIC                                2007-10   whois.apnic.net     ALLOCATED        
116/8   APNIC                                2007-01   whois.apnic.net     ALLOCATED        
117/8   APNIC                                2007-01   whois.apnic.net     ALLOCATED        
118/8   APNIC                                2007-01   whois.apnic.net     ALLOCATED        
119/8   APNIC                                2007-01   whois.apnic.net     ALLOCATED        
120/8   APNIC                                2007-01   whois.apnic.net     ALLOCATED        
121/8   APNIC                                2006-01   whois.apnic.net     ALLOCATED          
122/8   APNIC                                2006-01   whois.apnic.net     ALLOCATED          
123/8   APNIC                                2006-01   whois.apnic.net     ALLOCATED          
124/8   APNIC                                2005-01   whois.apnic.net     ALLOCATED          
125/8   APNIC                                2005-01   whois.apnic.net     ALLOCATED          
126/8   APNIC                                2005-01   whois.apnic.net     ALLOCATED          
127/8   IANA - Loopback                      1981-09                       RESERVED           [5]
128/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
129/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
130/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
131/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
132/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
133/8   Administered by APNIC                1997-03   whois.apnic.net     LEGACY             
134/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
135/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
136/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
137/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
138/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
139/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
140/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
141/8   Administered by RIPE NCC             1993-05   whois.ripe.net      LEGACY             
142/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
143/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
144/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
145/8   Administered by RIPE NCC             1993-05   whois.ripe.net      LEGACY             
146/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
147/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
148/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
149/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
150/8   Administered by APNIC                1993-05   whois.apnic.net     LEGACY             
151/8   Administered by RIPE NCC             1993-05   whois.ripe.net      LEGACY             
152/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
153/8   Administered by APNIC                1993-05   whois.apnic.net     LEGACY             
154/8   Administered by AfriNIC              1993-05   whois.afrinic.net   LEGACY             
155/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
156/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
157/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
158/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
159/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
160/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
161/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
162/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
163/8   Administered by APNIC                1993-05   whois.apnic.net     LEGACY             
164/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
165/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
166/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
167/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
168/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
169/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             [6]
170/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             
171/8   Administered by APNIC                1993-05   whois.apnic.net     LEGACY             
172/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             [7]
173/8   ARIN                                 2008-02   whois.arin.net      ALLOCATED        
174/8   ARIN                                 2008-02   whois.arin.net      ALLOCATED        
175/8   IANA                                                               UNALLOCATED        
176/8   IANA                                                               UNALLOCATED        
177/8   IANA                                                               UNALLOCATED        
178/8   IANA                                                               UNALLOCATED        
179/8   IANA                                                               UNALLOCATED        
180/8   IANA                                                               UNALLOCATED        
181/8   IANA                                                               UNALLOCATED        
182/8   IANA                                                               UNALLOCATED        
183/8   IANA                                                               UNALLOCATED        
184/8   IANA                                                               UNALLOCATED        
185/8   IANA                                                               UNALLOCATED        
186/8   LACNIC                               2007-09   whois.lacnic.net    ALLOCATED        
187/8   LACNIC                               2007-09   whois.lacnic.net    ALLOCATED        
188/8   Administered by RIPE NCC             1993-05   whois.ripe.net      LEGACY        
189/8   LACNIC                               1995-06   whois.lacnic.net    ALLOCATED            
190/8   LACNIC                               1995-06   whois.lacnic.net    ALLOCATED          
191/8   Administered by LACNIC               1993-05   whois.lacnic.net    LEGACY             
192/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             [8]
193/8   RIPE NCC                             1993-05   whois.ripe.net      ALLOCATED          
194/8   RIPE NCC                             1993-05   whois.ripe.net      ALLOCATED          
195/8   RIPE NCC                             1993-05   whois.ripe.net      ALLOCATED          
196/8   Administered by AfriNIC              1993-05   whois.afrinic.net   LEGACY             
197/8   IANA                                                               UNALLOCATED        
198/8   Administered by ARIN                 1993-05   whois.arin.net      LEGACY             [9]
199/8   ARIN                                 1993-05   whois.arin.net      ALLOCATED          
200/8   LACNIC                               2002-11   whois.lacnic.net    ALLOCATED          
201/8   LACNIC                               2003-04   whois.lacnic.net    ALLOCATED          
202/8   APNIC                                1993-05   whois.apnic.net     ALLOCATED          
203/8   APNIC                                1993-05   whois.apnic.net     ALLOCATED          
204/8   ARIN                                 1994-03   whois.arin.net      ALLOCATED          
205/8   ARIN                                 1994-03   whois.arin.net      ALLOCATED          
206/8   ARIN                                 1995-04   whois.arin.net      ALLOCATED          
207/8   ARIN                                 1995-11   whois.arin.net      ALLOCATED          
208/8   ARIN                                 1996-04   whois.arin.net      ALLOCATED          
209/8   ARIN                                 1996-06   whois.arin.net      ALLOCATED          
210/8   APNIC                                1996-06   whois.apnic.net     ALLOCATED          
211/8   APNIC                                1996-06   whois.apnic.net     ALLOCATED          
212/8   RIPE NCC                             1997-10   whois.ripe.net      ALLOCATED          
213/8   RIPE NCC                             1993-10   whois.ripe.net      ALLOCATED          
214/8   US-DOD                               1998-03                       LEGACY             
215/8   US-DOD                               1998-03                       LEGACY             
216/8   ARIN                                 1998-04   whois.arin.net      ALLOCATED          
217/8   RIPE NCC                             2000-06   whois.ripe.net      ALLOCATED          
218/8   APNIC                                2000-12   whois.apnic.net     ALLOCATED          
219/8   APNIC                                2001-09   whois.apnic.net     ALLOCATED          
220/8   APNIC                                2001-12   whois.apnic.net     ALLOCATED          
221/8   APNIC                                2002-07   whois.apnic.net     ALLOCATED          
222/8   APNIC                                2003-02   whois.apnic.net     ALLOCATED          
223/8   IANA                                                               UNALLOCATED        
224/8   Multicast                            1981-09                       RESERVED           [10]
225/8   Multicast                            1981-09                       RESERVED           [10]           
226/8   Multicast                            1981-09                       RESERVED           [10]           
227/8   Multicast                            1981-09                       RESERVED           [10]           
228/8   Multicast                            1981-09                       RESERVED           [10]           
229/8   Multicast                            1981-09                       RESERVED           [10]           
230/8   Multicast                            1981-09                       RESERVED           [10]           
231/8   Multicast                            1981-09                       RESERVED           [10]           
232/8   Multicast                            1981-09                       RESERVED           [10]           
233/8   Multicast                            1981-09                       RESERVED           [10]           
234/8   Multicast                            1981-09                       RESERVED           [10]           
235/8   Multicast                            1981-09                       RESERVED           [10]           
236/8   Multicast                            1981-09                       RESERVED           [10]           
237/8   Multicast                            1981-09                       RESERVED           [10]           
238/8   Multicast                            1981-09                       RESERVED           [10]           
239/8   Multicast                            1981-09                       RESERVED           [10]           
240/8   Future use                           1981-09                       RESERVED           [11]
241/8   Future use                           1981-09                       RESERVED           [11]           
242/8   Future use                           1981-09                       RESERVED           [11]          
243/8   Future use                           1981-09                       RESERVED           [11]           
244/8   Future use                           1981-09                       RESERVED           [11]           
245/8   Future use                           1981-09                       RESERVED           [11]           
246/8   Future use                           1981-09                       RESERVED           [11]           
247/8   Future use                           1981-09                       RESERVED           [11]           
248/8   Future use                           1981-09                       RESERVED           [11]           
249/8   Future use                           1981-09                       RESERVED           [11]           
250/8   Future use                           1981-09                       RESERVED           [11]           
251/8   Future use                           1981-09                       RESERVED           [11]           
252/8   Future use                           1981-09                       RESERVED           [11]           
253/8   Future use                           1981-09                       RESERVED           [11]           
254/8   Future use                           1981-09                       RESERVED           [11]           
255/8   Future use                           1981-09                       RESERVED           [11]           



Notes
-----
[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 [RFC3330]

[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.

[5]  127.0.0.0/8 is reserved for Loopback [RFC3330]

[6]  169.254.0.0/16 reserved for Link Local [RFC3330]

[7]  172.16.0.0/12 reserved for Private-Use Networks [RFC1918]

[8]  192.0.2.0/24  reserved for Test-Net [RFC3330]
     192.88.99.0/24 reserved for 6to4 Relay Anycast [RFC3068]
     192.168.0.0/16 reserved for Private-Use Networks [RFC1918]

[9]  198.18.0.0/15 reserved for Network Interconnect Device
     Benchmark Testing [RFC3330]

[10] Multicast (formerly "Class D") [RFC1700]
     See: http://www.iana.org/assignments/multicast-addresses

[11] Reserved for future use (formerly "Class E") [RFC1700]
                  


Reference
---------

[RFC1356]  Malis, A., Robinson, D., and R. Ullmann, "Multiprotocol
           Interconnect on X.25 and ISDN in the Packet Mode",
           RFC 1356, August 1992.

[RFC1466]  Gerich, E., "Guidelines for Management of IP Address
           Space", RFC 1466, May 1993.

[RFC1700]  Reynolds, J. and J. Postel, "Assigned Numbers",
           RFC1700, October 1994.

[RFC1918]  Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G.,
           and E. Lear, "Address Allocation for Private
           Internets", BCP 5, RFC 1918, February 1996.

[RFC2050]  Hubbard, K., Kosters, M., Conrad, D., Karrenberg, D.,
           and J. Postel, "INTERNET REGISTRY IP ALLOCATION
           GUIDELINES", BCP 12, RFC 2050, November 1996.

[RFC3068]  Huitema, C., "An Anycast Prefix for 6to4 Relay
           Routers", RFC 3068, June 2001.

[RFC3171]  Albanna, Z., Almeroth, K., Meyer, D., and M. Schipper,
           "IANA Guidelines for IPv4 Multicast Address
           Assignments", BCP 51, RFC 3171, August 2001.

[RFC3330]  IANA, "Special-Use IPv4 Addresses", RFC 3330,
           September 2002.