DNS on Windows Server 2003, 3rd Edition

No PTR Data for Name Server’s Address

Here’s a cryptic message:

C:\> nslookup 
*** Can't find server name for address 192.249.249.3: Non-existent domain
Default Server:  UnKnown
Address:  192.249.249.3

>

The “Non-existent domain” message means that there’s no PTR record for 3.249.249.192.in-addr.arpa. In other words, nslookup couldn’t find the name for 192.249.249.3, which is the first name server the resolver is configured to query. The only reason nslookup looks up this address is to print the “Default Server” startup message. Obviously, this name server’s data is messed up, at least for the 249.249.192.in-addr.arpa zone, so nslookup prints “UnKnown.”