Lee Howard Asked Whether an ISP Could Grade Its Own IPv4 Homework

Summary

• At ARIN 40 in October 2017, Lee Howard asked whether a large ISP could assign too much IPv4 space to its own departments, then point to those internal assignments when seeking a transfer. He posed a hypothetical, not an accusation against a named operator.
• ARIN’s John Sweeting said a large transfer request would bring those self-assignments back under review. The community later removed the older advance-approval rule for large reassignments; ARIN implemented that change on 24 July 2018.

John Sweeting arrived at the microphone with a ticket pile. Under the policy then in force, ARIN staff had to approve certain large IPv4 reassignments and reallocations before an ISP made them. He described more than a thousand such tickets in 2016, roughly 70 percent involving an ISP assigning space to a division of itself. The free pool had gone. Address space had a price. Why keep grading every internal assignment before it happened?

Howard heard a loophole in that tidy story. Imagine, he said, a large ISP distributing lavish blocks among its departments while addresses still looked cheap. Later, when it wanted a transfer, the company could point to its own paperwork as evidence of heavy use. The trick in this thought experiment is that every form can be filled out correctly while the underlying allocation remains wasteful. Howard was testing where the scrutiny would move, not reporting a fraud case.

Sweeting’s reply put a second desk behind the first. If that ISP sought approval for a large recipient transfer, ARIN would examine what the company already held, including the space it had assigned to itself, and ask for justification again. An old approval slip would not automatically buy a new block. Howard acknowledged the point. The meeting transcript also contains a small numerical snag: Sweeting said about 70 percent of the tickets were self-SWIPs; Howard referred to 17 percent while asking his question. The policy argument rests on the workflow, not on turning that mismatch into a statistic.

The follow-through is unusually clear. ARIN-2017-13 proposed deleting the old advance review requirement in Section 4.2.3.5, arguing that costly IPv4 transfers already discouraged oversized customer assignments. ARIN’s Board adopted the proposal in May 2018, and the new policy took effect that July. Howard’s hypothetical had not vetoed the change. It had forced the room to say aloud where a future transfer application would meet a real question.

There are three pieces of paper here, and mixing them up ruins the story: a reported reassignment, an old advance approval, and evidence examined when a company requests more space. ARIN’s current reporting guide still calls for IPv4 subdelegations of /29 or larger to be reported within seven days. That reporting duty is separate from the 2018 removal of mandatory pre-approval for the larger blocks. Howard made the difference visible at a microphone, which is sometimes how a policy stops pretending it is a filing cabinet.