Confused about /24 in-addr.arpa NS delegation debug problem

[Phil Mayers]

On 01/06/2011 11:30 PM, Gary Wallis wrote:
> (Some dig output lines deleted to keep short)
>
> Why does this not work (but below next dig with +trace seems to imply
> that it should?):

The delegation looks invalid:

>
> 147.95.81.in-addr.arpa. 172800  IN      NS      ns1.theplanet.com.
> 147.95.81.in-addr.arpa. 172800  IN      NS      ns2.theplanet.com.
> ;; Received 93 bytes from 202.12.29.59#53(SEC1.APNIC.NET) in 317 ms

Delegation nameservers above differ from nameservers in-zone below

>
> 147.95.81.in-addr.arpa. 86400   IN      NS      ns2.callingcloud.net.
> 147.95.81.in-addr.arpa. 86400   IN      NS      ns1.callingcloud.net.
> ;; Received 96 bytes from 207.218.247.135#53(ns1.theplanet.com) in 106 ms
>