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IP Address Blocks ARIN Issues From

ARIN allocates and assigns IP address blocks within its region from the following ranges. Information on all IP address blocks that IANA has assigned is available on the IANA website.

ARIN IPv4 Address Blocks

List of IPv4 prefixes that have been set aside for ARIN to allocate and assign from. All prefixes have the potential to have a /24 minimum size allocation issued from them.

  • 23.0.0.0/8¹
  • 24.0.0.0/8
  • 45.16.0.0/12
  • 45.32.0.0/11
  • 45.72.0.0/13
  • 50.0.0.0/8
  • 63.0.0.0/8
  • 64.0.0.0/8
  • 65.0.0.0/8
  • 66.0.0.0/8
  • 67.0.0.0/8
  • 68.0.0.0/8
  • 69.0.0.0/8
  • 70.0.0.0/8
  • 71.0.0.0/8
  • 72.0.0.0/8
  • 73.0.0.0/8
  • 74.0.0.0/8
  • 75.0.0.0/8
  • 76.0.0.0/8
  • 96.0.0.0/8
  • 97.0.0.0/8
  • 98.0.0.0/8
  • 99.0.0.0/8
  • 100.0.0.0/8
  • 104.0.0.0/8
  • 107.0.0.0/8
  • 108.0.0.0/8
  • 135.0.0.0/8
  • 136.0.0.0/8
  • 142.0.0.0/8
  • 147.0.0.0/8
  • 162.0.0.0/8
  • 166.0.0.0/8
  • 172.0.0.0/8
  • 173.0.0.0/8
  • 174.0.0.0/8
  • 184.0.0.0/8
  • 192.0.0.0/8
  • 198.0.0.0/8
  • 199.0.0.0/8
  • 204.0.0.0/8
  • 205.0.0.0/8
  • 206.0.0.0/8
  • 207.0.0.0/8
  • 208.0.0.0/8
  • 209.0.0.0/8
  • 216.0.0.0/8

¹ From within the 23.0.0.0/8, ARIN is issuing blocks out of 23.128.0.0/10 per NRPM Section 4.10. Per policy, this block is subject to a minimum size allocation of /28 and a maximum size allocation of /24. ARIN uses sparse allocation when possible within this /10 block.

ARIN IPv6 Allocation Blocks

List of IPv6 prefixes that have been set aside for ARIN to allocate from.

  • 2001:0400::/23
  • 2001:1800::/23
  • 2001:4800::/23
  • 2600:0000::/12 ²
  • 2610:0000::/23

² ARIN is issuing IPv6 transitional technology blocks from 2602:0000::/16. For more information, please see NRPM Section 6.5.2.1.

ARIN IPv6 Assignment Blocks

List of IPv6 prefixes that have been set aside for ARIN to assign from.

  • 2620:0000::/23