ARIN Enters Phase Two of the IPv4 Countdown Plan

Posted: Tuesday, 18 September 2012

ARIN now has 3 /8s of available space in its inventory and has moved into Phase Two of its IPv4 Countdown Plan.

There are three key changes that are triggered in this phase.

1. All /16 and larger IPv4 requests will be placed in the IPv4 Review Team queue, and will be reviewed in the order they were received according to their timestamp. Because each correspondence will be processed in sequence, it is possible that response times may exceed the usual two-day turnaround.

2. Once a request is approved, the requestor will have 60 days to complete payment and return a signed RSA (if applicable). If payment and signed RSA have not been received by the 61st day, the ticket will automatically close, the address space will be released back into the available IPv4 pool, and a new request will need to be submitted.

NOTE: This change to the approval window from 90 days to 60 days will apply to all IPv4 requests, but not to IPv6 and ASN requests.

3. The hold time for all returned, reclaimed and revoked IPv4 resources will be reduced from six to three months.

Phase 2 will provide ARIN staff operational experience using the team review approach to ensure that these processes and procedures are effective for managing the distribution of the last of its IPv4 address pool.

We encourage you to visit the IPv4 Countdown Phase Two page at:

Please contact or our Help Desk +1.703.227.0660 if you have questions about these procedural changes.


Leslie Nobile
Director, Registration Services
American Registry for Internet Numbers (ARIN)