The WHOIS information of a domain is a collection of numerous details that are openly accessed via special lookup websites or a command line. The protocol which makes this possible has the same name and you can effortlessly see the organization 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 those listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain. All of this information must be valid and up-to-date all the time; otherwise the domain registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you must always make sure that the WHOIS details of your domain addresses are valid. Updating the WHOIS for a variety of country-code TLDs is limited, so when you register a completely new Internet domain, make sure you double-check the information that you're submitting.