ARIN Returns Some IPv4 Address Space to IANA

Posted: Monday, 11 June 2012

Given the recent ICANN Board adoption of Global Policy Proposal - IPv4–2011, the ARIN Board of Trustees at its 6 June meeting directed ARIN staff to return to the IANA the IPv4 address blocks that have been voluntarily returned to ARIN in recent years. The total amount of space being returned to the IANA amounts to roughly a /8 equivalent and includes the large block of IPv4 addresses returned to ARIN by Interop in 2010.

Below is the final list of address space that has been returned to the IANA and this will be reflected in ARIN's database within the next few hours.

  • 45.2.0.0/15
  • 45.4.0.0/14
  • 45.8.0.0/13
  • 45.16.0.0/12
  • 45.32.0.0/11
  • 45.64.0.0/10
  • 45.128.0.0/9
  • 66.218.132.0/23
  • 66.251.128.0/18
  • 72.44.16.0/20
  • 74.91.48.0/20
  • 144.48.0.0/16
  • 162.12.196.0/22
  • 162.12.200.0/21
  • 162.12.208.0/21
  • 162.12.216.0/22
  • 162.12.224.0/21
  • 162.12.232.0/22
  • 162.12.240.0/21
  • 192.75.4.0/24
  • 192.75.137.0/24
  • 192.75.236.0/24
  • 192.147.11.0/24
  • 192.156.202.0/24
  • 192.197.113.0/24
  • 192.231.238.0/24
  • 198.17.79.0/24
  • 199.21.172.0/22
  • 199.212.57.0/24
  • 204.8.204.0/22
  • 204.11.0.0/22
  • 204.48.32.0/23
  • 204.52.191.0/24
  • 204.225.42.0/23
  • 205.211.83.0/24
  • 207.115.112.0/20
  • 208.73.240.0/22
  • 208.85.156.0/22
  • 209.107.128.0/18
  • 216.98.208.0/20
  • 216.250.96.0/20

Regards,

Communications and Member Services
American Registry for Internet Numbers (ARIN)