The WHOIS info of a domain name is a collection of numerous details which are freely accessed via special lookup Internet sites or a command line. The protocol which makes this possible carries the same name and you could very easily see the company where an Internet domain has been registered, the creation, expiration and last update dates together with the names, postal and email address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain address. This information ought to be valid and up-to-date at all times; otherwise the Internet domain registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you should always ensure that the WHOIS details of your domains are valid. Updating the WHOIS for a number of country-code TLDs is limited, so any time you register a completely new domain address, you should double-check the info you are submitting.