The WHOIS info of a domain name is a collection of a number of details which are publicly accessed via special lookup Internet sites or a command line. The protocol which makes this possible carries the same name and you can easily see the company through which a domain has been registered, the creation, expiration and last update dates as well as the names, postal and e-mail address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific Internet domain. This info must be correct and up-to-date all the time; if it's not the domain registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you must always make certain that the WHOIS details of your domain names are valid. Updating the WHOIS for a number of country-code TLDs is limited, so when you register a new Internet domain, you ought to double-check the information you are submitting.