The WHOIS information of a domain is a collection of various details that are freely accessed through specific lookup Internet sites or a command line. The protocol which makes this possible has the same name and you can effortlessly see the organization through which a 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 particular domain name. All of this info ought to be correct and up-to-date all the time; otherwise 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 names are valid. Updating the WHOIS for several country-code TLDs is limited, so any time you register a brand new domain name, you should double-check the info you're submitting.