Looking at this a little deeper, there are four sub-registries for
the Locally-Served DNS Zones.

The first two sub-registries, the IPv4 and IPv6 Locally-Served DNS Zone
Registries, should be changed to "Expert Review". However, with an
additional restriction that allows only address blocks from one of the
Special-Purpose Address Space registries to be added to the corresponding
Locally-Served DNS Zones registry. Except when an address block is
concurrently added to both registries.

Adding an address block to one of the Special-Purpose Address Space
registries requires "IETF Review." Following that, "Expert Review" is
probably sufficient if it was forgotten to be added to the Locally-Served
DNS Zones registry, as is the case with the Expanded IPv6 Documentation
Address Space. However, adding an address block to the IPv4 or IPv6
Locally-Served DNS Zone Registries effectively makes it a special-purpose
address block. So, requiring Special-Purpose Address Space designation
before or concurrent with the addition to the Locally-Served DNS Zone
Registries seems appropriate.

However, I'm not sure that "Expert Review" is the appropriate registry
procedure for the other two sub-registries, the Transport-Independent
Locally-Served DNS Zone Registry, and the service.arpa Subdomain registry.

Thanks.

On Thu, Nov 20, 2025 at 3:26 AM <[email protected]> wrote:

> Hi David, all,
>
> (also adding dnsop)
>
>
>
> Adding 3fff::/20 to "Locally-Served DNS Zones" registry makes sense.
> However, given the registration policy of that registry and lack of a rule
> that would allow us to automatically add prefixes with similar properties
> to that registry, I checked with IANA and also consulted with the IESG
> colleagues about how we better handle this.
>
>
>
> Given also that future similar issues may happen (the DNS registry may not
> be known for other WGs, in particular), the suggested approach is to relax
> the registration policy of "Locally-Served DNS Zones" registry to “Expert
> Review” instead of “IETF Review”. This would be similar to the fix in
> https://datatracker.ietf.org/doc/rfc9650/ but for another registry.
>
>
>
> If there is a volunteer to write a short draft to fix this, and there are
> no objections to relax the registration policy, I think that this is a
> document that we can fast track in DNSOP (or even as AD sponsored).
>
>
>
> Comments are welcome.
>
>
>
> Cheers,
>
> Med
>
>
>
> *De :* David Farmer <[email protected]>
> *Envoyé :* vendredi 17 octobre 2025 19:33
> *À :* Nick Buraglio <[email protected]>; Geoff Huston <
> [email protected]>; V6Ops Chairs <[email protected]>
> *Cc :* V6 Ops List <[email protected]>
> *Objet :* [v6ops] Expanded IPv6 Documentation Address Space and the
> "Locally-Served DNS Zones" registry
>
>
>
>
>
> V6ops Chairs and RFC9637 Authors,
>
>
>
> I have been reviewing several IANA registries and noticed that
> the Expanded IPv6 Documentation Address Space 3fff::/20 has not been added
> to the "Locally-Served DNS Zones" registry.
>
>
>
> Given that RFC 9637 updates RFC 3849, and RFC 6303 referenced RFC 3849 and
> included 2001:db8::/32 (8.B.D.0.1.0.0.2.IP6.ARPA) in the "Locally-Served
> DNS Zones" registry [1], I believe 3fff::/20 (0.F.F.F.3.IP6.ARPA) should
> also be added to that registry, but it has not been added.
>
>
>
> What is the proper procedure to correct this?
>
>
>
> I think, with RFC 9637 and the "IETF Review" registration procedure for
> that registry, it should simply be a request to the IESG and/or IANA.
>
>
>
> Thanks.
>
>
>
> [1]
> https://www.iana.org/assignments/locally-served-dns-zones/locally-served-dns-zones.xhtml#ipv6
>
>
>
> --
>
> ===============================================
> David Farmer               Email:[email protected]
> Networking & Telecommunication Services
> Office of Information Technology
> University of Minnesota
> 2218 University Ave SE        Phone: 612-626-0815
> Minneapolis, MN 55414-3029   Cell: 612-812-9952
> ===============================================
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-- 
===============================================
David Farmer               Email:[email protected]
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE        Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
===============================================
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