The WHOIS information of an domain name is a collection of numerous details which are publicly accessed via special lookup websites or a command line. The protocol that makes this possible bears the same name and you can effortlessly see the organization where an Internet domain has been registered, the creation, expiration and last update dates in addition to the names, postal and email address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain address. This information ought to be correct and up-to-date all the time; if not the domain name registration can be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you should always make sure that the WHOIS details of your domains are legitimate. Updating the WHOIS for a number of country-code TLDs is limited, so any time you register a completely new domain name, it is best to double-check the info that you are submitting.