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I am about to close this issue chalking this up to improper registration of hosts in a subdomain. Specifically, IP address 134.79.23.45 is registered with two names in the sdf subnet: sdfdtn005.sdf.slac.stanford.edu and sdfdtn005.slac.stanford.edu. The reverse translation of the IP address only resolves to the name sfdtn005.sdf.slac.stanford.edu.

Now the same lookup outside of the subdomain the IP address is only attached to the host name sdfdtn005.slac.stanford.edu and host name sfdtn005.sdf.slac.stanford.edu is not accessible (i.e.not registered).

I would say this is incorrect as both names have the same IP address so there is no reason not to make the registration consistent across DNS servers.

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