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