IP Address Space Allocated to ARIN
IANA has allocated the address blocks below to ARIN for allocation and assignment within its region. Information on all IP address blocks that IANA has assigned is available at:
http://www.iana.org/ipaddress/ip-addresses.htm.
IPv4 Blocks
| CIDR Block |
Smallest Allocation |
| 24.0.0.0/8 |
/20 |
| 63.0.0.0/8 |
/20 |
| 64.0.0.0/8 |
/20 |
| 65.0.0.0/8 |
/20 |
| 66.0.0.0/8 |
/20 |
| 67.0.0.0/8 |
/20 |
| 68.0.0.0/8 |
/20 |
| 69.0.0.0/8 |
/20 |
| 70.0.0.0/8 |
/20 |
| 71.0.0.0/8 |
/20 |
| 72.0.0.0/8 |
/20 |
| 73.0.0.0/8 |
/20 |
| 74.0.0.0/8 |
/20 |
| 75.0.0.0/8 |
/20 |
| 76.0.0.0/8 |
/20 |
| 96.0.0.0/8 |
/20 |
| 97.0.0.0/8 |
/20 |
| 98.0.0.0/8 |
/20 |
| 99.0.0.0/8 |
/20 |
| 173.0.0.0/8 |
/20 |
| 174.0.0.0/8 |
/20 |
| 199.0.0.0/8 |
/24 |
| 204.0.0.0/8 |
/24 |
| 205.0.0.0/8 |
/24 |
| 206.0.0.0/8 |
/24 |
| 207.0.0.0/8 |
/24 |
| 208.0.0.0/8 |
/22 |
| 209.0.0.0/8 |
/20 |
| 216.0.0.0/8 |
/20 |
IPv6 Allocation Blocks
| CIDR Block |
| 2001:0400::/23 |
| 2001:1800::/23 |
| 2001:4800::/23 |
| 2600:0000::/12 |
| 2610:0000::/23 |
IPv6 Assignment Blocks
| CIDR Block |
| 2620:0000:/23 |