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Whois is the transport protocol, which is used for lookup the domaininformation about its IP, owner,and etc. In short, Whois is a database which can lookupwhetherthe domainhas been registered or not, and domain detailed registration information like domain registrant, domain registrar, and etc.Whoiscan realize the domain information lookup. At early phase, Whois lookupexists in command line interface, but now thereoccurredsome web interface tools to simplify online lookup, such as Tools (, which can lookup different database at a time.Each domain’s Whois information was kept by the corresponding management institution.Different domainsuffixneeds different Whois database to lookup and each Whois database has their own limitations, so the online lookup tools is not everything.