The WHOIS information of a domain is a collection of numerous details which are publicly accessed through special lookup Internet sites or a command line. The protocol that makes this possible carries the same name and you can easily see the firm through which an Internet domain has been registered, the creation, expiration and last update dates along with the names, postal and e-mail address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain address. All this info has to be valid and up-to-date constantly; otherwise the domain name registration could be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), this means you should always ensure that the WHOIS details of your domains are valid. Updating the WHOIS for several country-code TLDs is limited, so any time you register a new Internet domain, you should double-check the info that you are submitting.