The WHOIS information of a domain name is a collection of various details which are publicly accessed using special lookup websites or a command line. The protocol that makes this possible carries the same name and you may effortlessly see the company 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 those listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain. All of this info ought to be correct and up-to-date at all times; if it's not the domain address 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 when you register a completely new domain name, you ought to double-check the info you're submitting.