when i try to do a nslookup from our firewall this is what i get below

*** Can't find server name for address 172.16.1.26: Non-existent domain
*** Can't find server name for address 172.16.1.1: Non-existent domain
*** Default servers are not available
*** UnKnown can't find 172.18.4.4: Non-existent domain
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
Server: UnKnown
Address: 172.16.1.26

the 172.16.1.26 and 172.16.1.1 are my dns servers ... and i am trying to
query a dynamic ip address .. i was it to resolve the host name of the
pc .. any hints?
many thanks!
ryan