[arin-ppml] Draft Policy ARIN-2025-6: Fix formula in 6.5.2.1c

[William Herrin]

On Tue, Feb 17, 2026 at 9:24 AM John Sweeting <jsweeting at arin.net> wrote:
> Suggest you read the staff assessment again

Staff assessment:

"ARIN staff currently implements 6.5.2.1.c BASED ON THE TEXT ALONE.
The summarized formula is overly complex for your typical IPv6
requestor. The text alone is more easily understood by customers and
implemented by ARIN staff."

NRPM section 6.5.2.1c, first paragraph ('the text"):

"The maximum allowable allocation shall be the smallest
nibble-boundary aligned block that can provide an equally sized
nibble-boundary aligned block to each of the requesters serving sites
large enough to satisfy the needs of the requesters largest single
serving site using no more than 75% of the available addresses."

NRPM section 6.5.2.1c, second paragraph ("the summarized formula"):

"This calculation can be summarized as /N where N = P-(X+Y) and P is
the organization’s Provider Allocation Unit X is a multiple of 4
greater than 4/3*serving sites and Y is a multiple of 4 greater than
4/3*end sites served by largest serving site."

This formula, which staff explicitly says they do not implement, is
the only place in section 6.5.2 where PAU appears.

Regards,
Bill Herrin