The WHOIS info of an domain name is a collection of many details that are freely accessed through specific lookup Internet sites or a command line. The protocol which makes this possible carries the same name and you could very easily see the firm through which a domain name has been registered, the creation, expiration and last update dates in addition to the names, postal and email address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular Internet domain. All this info ought to be legitimate and up-to-date constantly; otherwise the domain name registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you must always ensure that the WHOIS details of your domains are valid. Updating the WHOIS for numerous country-code TLDs is limited, so whenever you register a new domain, it is best to double-check the information you're submitting.