_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
0_ 000/8 IANA - Local Identification[1] 001/8 APNIC 002/8 RIPE NCC 003/8 General Electric Company 004/8 Level 3 Communications, Inc. 005/8 RIPE NCC 006/8 Army Information Systems Center 007/8 Administered by ARIN 008/8 Level 3 Communications, Inc. 009/8 IBM 010/8 IANA - Private Use[2] 011/8 DoD Intel Information Systems 012/8 AT&T Bell Laboratories 013/8 Xerox Corporation 014/8 APNIC[3] 015/8 Hewlett-Packard Company
1_ 016/8 Digital Equipment Corporation 017/8 Apple Computer Inc. 018/8 MIT 019/8 Ford Motor Company 020/8 Computer Sciences Corporation 021/8 DDN-RVN 022/8 Defense Information Systems Agency 023/8, 024/8 ARIN 025/8 UK Ministry of Defence 026/8 Defense Information Systems Agency 027/8 APNIC 028/8 DSI-North 029/8, 030/8 Defense Information Systems Agency 031/8 RIPE NCC
2_ 032/8 AT&T Global Network Services 033/8 DLA Systems Automation Center 034/8 Halliburton Company 035/8 MERIT Computer Network 036/8 APNIC 037/8 RIPE NCC 038/8 PSINet, Inc. 039/8 IANA 040/8 Eli Lily & Company 041/8 AfriNIC 042/8 APNIC 043/8 Administered by APNIC 044/8 Amateur Radio Digital Communications 045/8 Administered by ARIN 046/8 RIPE NCC 047/8 Bell-Northern Research
3_ 048/8 Prudential Securities Inc. 049/8 APNIC 050/8 ARIN 051/8 UK Government Department for Work and Pensions 052/8 E.I. duPont de Nemours and Co., Inc. 053/8 Cap Debis CCS 054/8 Merck and Co., Inc. 055/8 DoD Network Information Center 056/8 US Postal Service 057/8 SITA 058/8-061/8 APNIC 062/8 RIPE NCC 063/8 ARIN
4_ 064/8-076/8 ARIN 077/8-079/8 RIPE NCC
5_ 080/8-095/8 RIPE NCC
6_ 096/8-100/8 ARIN 101/8 APNIC 102/8-104/8 IANA 105/8 AfriNIC 106/8 IANA 107/8,108/8 ARIN 109/8 RIPE NCC 110/8,111/8 APNIC
7_ 112/8-126/8 APNIC 127/8 IANA - Loopback[4]
8_ 128/8-132/8 Administered by ARIN 133/8 Administered by APNIC 134/8-140/8 Administered by ARIN 141/8 Administered by RIPE NCC 142/8,143/8 Administered by ARIN
9_ 144/8 Administered by ARIN 145/8 Administered by RIPE NCC 146/8-149/8 Administered by ARIN 150/8 Administered by APNIC 151/8 Administered by RIPE NCC 152/8 Administered by ARIN 153/8 Administered by APNIC 154/8 Administered by AfriNIC 155/8-159/8 Administered by ARIN
A_ 160/8-162/8 Administered by ARIN 163/8 Administered by APNIC 164/8-169/8 Administered by ARIN 169/8 Administered by ARIN[5] 170/8 Administered by ARIN 171/8 Administered by APNIC 172/8 Administered by ARIN[6] 173/8,174/8 ARIN 175/8 APNIC
B_ 176/8 RIPE NCC 177/8 LACNIC 178/8 RIPE NCC 179/8 IANA 180/8 APNIC 181/8 LACNIC 182/8,183/8 APNIC 184/8 ARIN 185/8 IANA 186/8,187/8 LACNIC 188/8 Administered by RIPE NCC 189/8,190/8 LACNIC 191/8 Administered by LACNIC
C_ 192/8 Administered by ARIN[7][8] 193/8,195/8 RIPE NCC 196/8 Administered by AfriNIC 197/8 AfriNIC 198/8 Administered by ARIN[9] 199/8 ARIN 200/8,201/8 LACNIC 202/8 APNIC 203/8 APNIC[10] 204/8-207/8 ARIN
D_ 208/8,209/8 ARIN 210/8,211/8 APNIC 212/8,213/8 RIPE NCC 214/8,215/8 US-DOD 216/8 ARIN 217/8 RIPE NCC 218/8-223/8 APNIC
E_ 224/8-233/8 Multicast[11] 234/8 Multicast[11][12] 235/8-238/8 Multicast[11] 239/8 Multicast[11][13]
F_ 240/8-224/8 Future use[14] 255/8 Future use[14][15]

colors:

status[16]
ALLOCATED
UNALLOCATED
RESERVED
LEGACY
  1. 0.0.0.0/8 reserved for self-identification RFC 5735
  2. Reserved for Private-Use Networks RFC 1918
  3. This was reserved for Public Data Networks RFC 1356 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
  4. 127.0.0.0/8 is reserved for Loopback RFC 5735
  5. 169.254.0.0/16 reserved for Link Local RFC 5735
  6. 172.16.0.0/12 reserved for Private-Use Networks RFC 1918
  7. 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 reserved for Private-Use Networks RFC 1918
  8. 192.0.0.0/24 reserved for IANA IPv4 Special Purpose Address Registry RFC 5736
  9. 198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing RFC 5735 198.51.100.0/24 reserved for TEST-NET-2 RFC 5737
  10. 203.0.113.0/24 reserved for TEST-NET-3 RFC 5737
  11. a b c d Multicast (formerly "Class D") RFC 5771 registed in http://www.iana.org/assignments/multicast-addresses
  12. Unicast-Prefix-Based IPv4 Multicast Addresses RFC 6034
  13. Administratively Scoped IP Multicast RFC 2365
  14. a b Reserved for future use (formerly "Class E") RFC 1112
  15. 255.255.255.255 is reserved for "limited broadcast" destination address RFC 0919 and RFC 0922
  16. 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.