The WHOIS information of a domain is a collection of many details that are openly accessed via specific lookup websites or a command line. The protocol that makes this possible carries the same name and you could easily see the organization through which a domain address has been registered, the creation, expiration and last update dates along with the names, postal and email address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain. All of this information has to be valid and up-to-date all the time; if not the domain address registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you must always make certain that the WHOIS details of your domains are accurate. Updating the WHOIS for a variety of country-code TLDs is limited, so when you register a new domain name, make sure you double-check the information you're submitting.