The WHOIS information of a domain is a collection of numerous details that are openly accessed through special lookup sites or a command line. The protocol which makes this possible has the same name and you can very easily see the organization through which a domain address has been registered, the creation, expiration and last update dates along with the names, postal and e-mail address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain name. All this information ought to be valid and up-to-date all the time; if it's not the 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 addresses are legitimate. Updating the WHOIS for a number of country-code TLDs is limited, so any time you register a brand new Internet domain, it is best to double-check the info you are submitting.