The WHOIS information of a domain name is a collection of many details that are freely accessed through specific lookup websites or a command line. The protocol which makes this possible bears the same name and you can easily see the firm where a domain has been registered, the creation, expiration and last update dates together with the names, postal and e-mail address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain. All this info ought to be correct and up-to-date constantly; if not the domain address registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you must always ensure that the WHOIS details of your domain addresses are accurate. Updating the WHOIS for numerous country-code TLDs is limited, so when you register a new domain address, make sure you double-check the info that you're submitting.