The WHOIS info of a domain name is a collection of a variety of details which are publicly accessed through special lookup websites or a command line. The protocol that makes this possible carries the same name and you can very easily see the organization where an Internet domain has been registered, the creation, expiration and last update dates together with the names, postal and e-mail address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain name. This info has to be valid and up-to-date at all times; if not the Internet domain registration may 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 domain addresses are valid. Updating the WHOIS for several country-code TLDs is limited, so whenever you register a completely new domain address, you should double-check the information you're submitting.