Summary

  • ARIN-2021-2 names Kerrie Richards and Matthew Wilder as co-shepherds. It fixed a /20 IPv4 holdings test for waiting-list applicants by excluding special-use space issued under sections 4.4 and 4.10.
  • ARIN's policy record cites a Policy Experience Report describing three instances of confusion in three weeks. The change was adopted on 25 January 2022; the exclusion remains in the current NRPM 4.1.8.

Imagine being told that your organization has too many IPv4 addresses to join the waiting list. Now imagine that some of the addresses being counted were reserved for an internet exchange or to help deploy IPv6. You cannot simply turn those blocks into ordinary office or customer space. The queue's arithmetic would have made a specialist look rich in addresses it could not spend.

That was the wrinkle Matthew Wilder and Kerrie Richards co-shepherded through ARIN-2021-2. ARIN's waiting-list rule barred an organization holding more than a /20 equivalent of IPv4 in aggregate. A separate sentence already said that allocations under section 4.4, for critical infrastructure, and section 4.10, for IPv6 deployment, came from their own reserved pools rather than the general waiting list. Yet the /20 sentence did not say whether those special blocks counted toward the applicant's holdings. The gate and the inventory sheet disagreed.

The proposal's problem statement gives the practical examples: a top-level-domain operator with addresses for domain infrastructure, or an organization running several internet exchanges. Both may hold blocks for a job that ordinary space cannot do. An ARIN staff assessment quoted in the policy record had already described a count excluding sections 4.4 and 4.10. A later Policy Experience Report, as cited there, reported three bouts of confusion in as many weeks. That is evidence of an interpretive problem, not a tally of rejected applicants.

The fix was one parenthesis with real consequences. After “more than a /20 equivalent,” the policy added that the aggregate was exclusive of special-use space received under 4.4 or 4.10. ARIN adopted the measure on 25 January 2022 and lists it as implemented. The current manual still prints the exclusion in section 4.1.8.

The /20 threshold measures what an applicant already holds. The separate /22 maximum governs how much an organization can qualify for from the waiting list at one time, with a smaller block down to /24 available by choice. Confusing those numbers would create a second counting problem just as the first one was cleared up.

Wilder's contribution was to make the boundary legible. Address scarcity turns a ledger entry into a decision about access. If a reserved block is entered in the wrong column, a policy meant to ration ordinary IPv4 space can punish an operator for keeping a public-purpose service running. One small parenthesis told the queue clerk which column to read.