AT&T refuses to provide PTR records?

Jack Bates jbates at
Tue Oct 17 21:25:25 UTC 2006

Mike Walter wrote:
> We have a customer that has AT&T and they reassigned the IP space to our
> name servers to allow us to do reverse DNS for them.

We had a similar situation. AT&T states that they will only handle rDNS using 
domains that they control. They will happily CNAME the IPs appropriately or 
reassign the IP space, depending on block size and request.

The issue we ran into was that we couldn't get them to *unassign* a CNAME for an 
IP block so that it would fail immediately, and so servers (web,ftp, etc) which 
requested rDNS for the connection information would time out connections waiting 
for the non-existent nameservers. We weren't really interested in handling rDNS 
for the IP given that it wasn't handling mail, web, or have any A records 
pointing to it. It is the easiest way to get it done, though.

Jack Bates

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