The WHOIS info of an domain is a collection of various details that are freely accessed using specific lookup websites or a command line. The protocol that makes this possible has the same name and you can easily see the company through which a domain address has been registered, the creation, expiration and last update dates in addition to the names, postal and email address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain name. All this information ought to be valid and up-to-date constantly; if not the domain name registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you should always make certain that the WHOIS details of your domain names are legitimate. Updating the WHOIS for numerous country-code TLDs is limited, so whenever you register a brand new domain address, you should double-check the information you're submitting.