Posted: Wednesday, 23 April 2014
ARIN is down to its final /8 of available space in its inventory and has moved into Phase Four of its IPv4 Countdown Plan. All IPv4 requests are now subject to Countdown Plan processes, so please review the following details carefully.
All IPv4 requests will be processed on a "First in, First out" basis, and all requests of any size will be subject to team review, and requests for /15 or larger will require department director approval. ARIN's resource analysts will respond to tickets as they appear chronologically in the queue. Each ticket response is treated as an individual transaction, so the completion time of a single request may vary based on customer response times and the number of requests waiting in the queue. Because each correspondence will be processed in sequence, it is possible that response times may exceed our usual two-day turnaround.
The hold period for returned, reclaimed, and revoked blocks is now reduced to 60 days. All returned, revoked, and reclaimed IPv4 address space will go back into the available pool when the 60 day period has expired. Staff will continue to check routing/filtering on space being reissued and will notify recipients if there are issues.
When a request is approved, the recipient will have 60 days to complete payment and/or an RSA. On the 61st day, the address space will be released back to the available pool if payment and RSA are not completed.
We encourage you to visit the IPv4 Countdown Phase Four page at:
ARIN may experience situations where it can no longer fulfill qualifying IPv4 requests due to a lack of inventory of the desired block size. At that time, the requester may opt to accept the largest available block size or they may ask to be placed on the Waiting List for Unmet Requests. Full details about this process are available at:
Please contact firstname.lastname@example.org or our Help Desk +1.703.227.0660 if you have questions about these procedural changes.
Director, Registration Services
American Registry for Internet Numbers (ARIN)