The WHOIS information of a domain name is a collection of many details that are openly accessed using special lookup Internet sites or a command line. The protocol that makes this possible carries the same name and you may very easily see the company where a domain has been registered, the creation, expiration and last update dates in addition to the names, postal and e-mail address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain address. This info has to be valid and up-to-date all the time; if not the domain registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you must always make certain that the WHOIS details of your domain names are accurate. Updating the WHOIS for a variety of country-code TLDs is limited, so any time you register a new domain, make sure you double-check the info you're submitting.