The WHOIS information of a domain is a collection of a variety of details that are openly accessed through specific lookup Internet sites or a command line. The protocol that makes this possible bears the same name and you can very easily see the firm where a domain has been registered, the creation, expiration and last update dates in addition to the names, postal and email address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain address. All of this information should be valid and up-to-date constantly; otherwise the Internet domain registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you must always make sure that the WHOIS details of your domains are legitimate. Updating the WHOIS for numerous country-code TLDs is limited, so any time you register a completely new domain address, make sure you double-check the info that you're submitting.