Show all DNS in 192.168.0.*; only if reverse DNS is enabled on DNS server:

$ for I in `seq 1 254`; do host 192.168.0.$I | grep ^[^Host] | sed "s/.in-addr.*pointer/ points to ---->\t/"; done

If you need to see what queries are coming through your nameserver, toggle the querylog flag by typing:

$ rndc querylog

You need to restart Firefox for the modifications of hosts file to take effect (if you edited the hosts file while Firefox had been already opened).

This is a particularly tasty utility that will tell you what a site is (and has been) running along with hosting and DNS lookup information. Just replace www.google.com with the URL of your choosing.

http://toolbar.netcraft.com/site_report?url=http://www.google.com/

This file is essentially the same as the UNIX hosts file:

C:\Windows\System32\Drivers\etc\hosts