The WHOIS information of an domain name is a collection of many details that are openly accessed through specific lookup websites or a command line. The protocol which makes this possible bears the same name and you could easily see the firm through which an Internet domain has been registered, the creation, expiration and last update dates along with the names, postal and e-mail address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular Internet domain. All of this info should be correct and up-to-date all the time; if not the domain name 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 legitimate. Updating the WHOIS for a variety of country-code TLDs is limited, so any time you register a brand new domain, make sure you double-check the info you are submitting.