The WHOIS information of a domain is a collection of various 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 can easily see the company through which a domain address has been registered, the creation, expiration and last update dates along with the names, postal and email address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain name. All this information has to be legitimate and up-to-date at all times; if not the Internet domain registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you should always make certain that the WHOIS details of your domain names are legitimate. Updating the WHOIS for a number of country-code TLDs is limited, so whenever you register a new domain address, you ought to double-check the information you're submitting.