The WHOIS information of a domain name is a collection of a number of details that are freely accessed through special lookup Internet sites or a command line. The protocol that makes this possible has the same name and you may easily see the organization through which a domain has been registered, the creation, expiration and last update dates in addition to the names, postal and email address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain name. This information has to be valid and up-to-date all the time; if it's not 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 make certain that the WHOIS details of your domains are valid. Updating the WHOIS for numerous country-code TLDs is limited, so whenever you register a completely new domain address, it is best to double-check the info you are submitting.