Here you'll find the DNS to some of the most popular webhosts so you can use your own domain with their services.
Primary Name Server:
ns1.netfirms.com
216.32.198.6
Secondary Name Server:
ns2.netfirms.com
216.32.198.7
Primary Name Sever :
ns3.freeservers.com
208.185.127.163
Secondary Name Server :
ns4.freeservers.com
208.185.127.168
Portland.co.uk
Primary Name Server:
ns0.portland.co.uk
212.15.64.83
Secondary Name Server:
ns1.portland.co.uk
212.15.64.25
AbleInternet.com
Primary Name Server:
ns1.ableinternet.com
207.44.134.104
Secondary Name Server:
ns2.ableinternet.com
207.44.135.141