The WHOIS information of a domain name is a collection of numerous details which are openly accessed using special lookup websites or a command line. The protocol which makes this possible bears the same name and you can very easily see the firm where an Internet domain has been registered, the creation, expiration and last update dates in addition to the names, postal and e-mail address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular Internet domain. All this info should be correct and up-to-date at all times; if it's not the domain registration could be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you should always make sure that the WHOIS details of your domains are legitimate. Updating the WHOIS for several country-code TLDs is limited, so any time you register a new domain address, you ought to double-check the information you are submitting.