The WHOIS information of an domain is a collection of numerous details which are freely accessed using special lookup Internet sites or a command line. The protocol that makes this possible bears the same name and you could 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 the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain. This info has to be valid and up-to-date at all times; if not the domain name registration can 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 domain addresses are legitimate. Updating the WHOIS for a number of country-code TLDs is limited, so whenever you register a new domain, you ought to double-check the information you're submitting.