The WHOIS info of an domain is a collection of many details which are freely accessed using special lookup Internet sites or a command line. The protocol which makes this possible bears the same name and you may very easily see the company through which a domain address has been registered, the creation, expiration and last update dates as well as the names, postal and email address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular Internet domain. All of this info must be legitimate and up-to-date at all times; if not the domain address registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you should always ensure that the WHOIS details of your domains are legitimate. Updating the WHOIS for numerous country-code TLDs is limited, so when you register a brand new Internet domain, you ought to double-check the information you're submitting.