The WHOIS info of a domain is a collection of numerous details that are freely accessed using special lookup websites or a command line. The protocol which makes this possible has the same name and you could effortlessly see the company where a domain has been registered, the creation, expiration and last update dates as well as the names, postal and e-mail address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain address. All this information has to be valid and up-to-date constantly; if not the domain registration could 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 domains are legitimate. Updating the WHOIS for a variety of country-code TLDs is limited, so whenever you register a new Internet domain, make sure you double-check the info you're submitting.