Re: Accidental ARIN Reallocation

[William Herrin via NANOG <nanog () lists nanog org>]

On Fri, Dec 12, 2025 at 11:49 AM Tony Tauber via NANOG
<nanog () lists nanog org> wrote:
> I would agree with Aaron1 that it's gratifying to see a public and
> relatively quick and thorough report.
> However, the write-up <https://www.arin.net/announcements/20251212/> raises
> questions for me:
>
>    - What is "NPRM 4.10 space"?
>       - I looked it up and think I somewhat understand that it's NRPM 4.10
>       <https://www.arin.net/participate/policy/nrpm/#4-10-dedicated-ipv4-allocation-to-facilitate-ipv6-deployment>
>       :Dedicated IPv4 Allocation to Facilitate IPv6 Deployment
>
>    What exact space falls in this category?
>
>    How is it used?

Hi Tony,

464xlat and similar technologies. Basically, ARIN has a set-aside for
folks who have IPv6 devices on an IPv6 network that have a need to
also talk to IPv4 devices on the Internet via one of the transition
technologies. For that specific use case, there's still a pool of
unallocated addresses available.

Regards,
Bill Herrin

-- 
For hire. https://bill.herrin.us/resume/
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