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Domain Registration:
whois.networksolutions.com
whois.register.com
whois.registrars.com
whois.opensrs.net
whois.afilias.info
whois.neulevel.biz
whois-servers.net (for most domains INCLUDING .cc)
whois.nic.uk (.co.uk &.org.uk domain queries)
whois.isi.edu  (.us domain queries)
whois.internic.net  (to identify registrar)

Numbers Allocation:
whois.arin.net (IP Netblocks)

Other:
What to look up:
 

WHOIS can be used to look up the registrant of a domain name or who ip space is allocated to.

To look up the owner of a domain, select "Domain Registration: whois.internic.net" then enter the domain name in the entry field, such as "cnn.com" or "iaxs.net".

You may also look up specific people that are associated with a domain by their name or handle, such as "IAXS Hostmaster Role" / "IHR-ORG"

Another tool is to look up who IP address space is allocated to. To do this, select "Numbers Allocation: whois.arin.net" then enter the known octets of the ip address, such as "209.134.128.1" or just "209.134.128".

As with domain handles, you may look up individuals that are associated with a network.

You may also enter "HELP" for more information on what you can query from the WHOIS server.