mysterious failures/wrong-answers in reverse DNS lookup

[Mark Andrews]

This is consistent with dns64 being configured with a prefix of 2607:f0b0:f::/96.
Have you been playing around with dns64?

> On 23 Jul 2025, at 15:19, Michael Richardson <mcr at sandelman.ca> wrote:
> 
> 
> obiwan-[~](3.3.8) mcr 10027 %dig @nic.sandelman.ca -x 2607:f0b0:f::babe:f00d ptr
> ;; ANSWER SECTION:
> d.0.0.f.e.b.a.b.0.0.0.0.0.0.0.0.0.0.0.0.f.0.0.0.0.b.0.f.7.0.6.2.ip6.arpa. 600 IN CNAME 13.240.190.186.in-addr.arpa.
> 13.240.190.186.in-addr.arpa. 86315 IN PTR 186-190-240-13.e-commercepark.com.

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org