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.
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