ARIN Retires IPv4 Countdown Plan

Posted: Wednesday, 01 June 2016

ARIN held an open consultation on the topic of retiring the IPv4 Countdown Plan in March and April of this year. Following the open consultation period, it was announced that the Plan would be retired on 1 June 2016.

The IPv4 Countdown Plan has now been retired. This includes the cessation of Phase 4 processing procedures in the review of IPv4 assignment/allocation requests. Going forward they will be handled via normal processes and no longer be serialized via team review of IPv4 request tickets. Removing these procedures allows the recovered staff time to be redirected to other registration related work activities inside the ARIN Registration Services Department, such as handling the increasing number of IPv4 transfers.

The full text of the consultation is available for review at:

For further information about IPv4 address options, visit:


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