The WHOIS info of an domain name is a collection of numerous details that are freely accessed via specific lookup websites or a command line. The protocol that makes this possible bears the same name and you may very easily see the firm where a domain address has been registered, the creation, expiration and last update dates together with the names, postal and e-mail address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain address. All this info ought to be legitimate and up-to-date all the time; if not the domain address registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), this means you should always ensure that the WHOIS details of your domain addresses are valid. Updating the WHOIS for several country-code TLDs is limited, so whenever you register a brand new Internet domain, you should double-check the information that you are submitting.