The WHOIS info of an domain name is a collection of a variety of details that are publicly accessed via specific lookup websites or a command line. The protocol which makes this possible carries the same name and you may very easily see the company where 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 people listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain. This information ought to be legitimate and up-to-date at all times; otherwise the Internet domain registration could be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you should always ensure that the WHOIS details of your domains are valid. Updating the WHOIS for a number of country-code TLDs is limited, so whenever you register a completely new domain name, make sure you double-check the information you're submitting.