The WHOIS information of a domain name is a collection of a variety of details which are openly accessed through special lookup Internet sites or a command line. The protocol which makes this possible bears the same name and you can very easily see the company through which a domain address has been registered, the creation, expiration and last update dates along with the names, postal and e-mail address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain. All this information should be correct and up-to-date at all times; otherwise the Internet domain registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), this means you should always make certain that the WHOIS details of your domain names are valid. Updating the WHOIS for numerous country-code TLDs is limited, so any time you register a brand new domain address, it is best to double-check the information you're submitting.