Domain WhoIs: Get whois informations about the specified domain

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Domain

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A domain name is an unique address identifying each site on the Internet, usually of two or more segments separated by full stops and it identifies one or more IP addresses. Domain names are used in URLs to identify particular Web pages. Every web site that you visit is stored under domain name.

Domain names are restricted to the ASCII letters "a" through "z" (case-insensitive), the digits "0" through "9", and the hyphen, with some other restrictions. Registrars restrict the domains to valid hostnames, since, otherwise, they would be useless.