The WHOIS information of a domain is a collection of a number of details that are freely accessed via special lookup Internet sites or a command line. The protocol that makes this possible bears the same name and you could easily see the firm through which 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 individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain. All this information should be legitimate and up-to-date all the time; otherwise the domain registration may 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 domain addresses are valid. Updating the WHOIS for numerous country-code TLDs is limited, so when you register a new domain name, it is best to double-check the information you are submitting.