Whois on-line

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domain information (domain owners and its contact information, domain registration and expiration dates, nameserver information etc.) in TLD registrars databases - list of all supported TLDs for whois queries is available in help.
IP address information for IP version 4 and IP version 6 (address block information, owner of this block contact information, owner identifiers etc.)
autonomous systems information (owner of this autonomous system contact information, list of neighbour autonomous systems and its interconnection etc.)
internet host information (get its IP address, link to domain information. If given hostname is CNAME for another hostname this hostname is shown too).
information about other objects in whois databases (identifiers of persons or organisations etc.).

Usage: fill your whois query into Query field and submit the form.

Download whois search plugin for Firefox or Mozilla and search whois information using your browser search field.