FAQ - 10 How do I identify the owner of a domain name

Question:

Answer: The quickest way is to use the global lookup tools such as Geektools, SamSpade, or uWhois multi-registrar WHOIS services. These are not authoritative directories, however, because they merely link to the databases of other directory services.

To verify actual registration data of a particular domain name, use the Whois tool hosted by the registry for the top level domain in question. UniNett keeps a list of links to all top level domain registries.