root@racanix-desktop:~# nslookup 192.168.0.6
Server: 192.168.0.6
Address: 192.168.0.6#53
6.0.168.192.in-addr.arpa name = racanix.com.
root@racanix-desktop:~# nslookup 192.168.0.6
Server: 192.168.0.6
Address: 192.168.0.6#53
6.0.168.192.in-addr.arpa name = racanix.com.
root@racanix-desktop:~# nslookup 192.168.0.6
Server: 200.52.12.131
Address: 200.52.12.131#53
** server can't find 6.0.168.192.in-addr.arpa.: NXDOMAIN