The WHOIS info of a domain is a collection of many details that are publicly accessed through special lookup sites or a command line. The protocol that makes this possible carries the same name and you could effortlessly see the firm where a domain name has been registered, the creation, expiration and last update dates in addition to the names, postal and email address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular Internet domain. All this info has to be valid and up-to-date constantly; if it's not the domain address registration could 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 domain names are accurate. Updating the WHOIS for a number of country-code TLDs is limited, so whenever you register a completely new domain, make sure you double-check the information you are submitting.