The WHOIS info of a domain is a collection of numerous details that are publicly accessed using special lookup websites or a command line. The protocol that makes this possible carries the same name and you may very easily see the company through which a domain address has been registered, the creation, expiration and last update dates in addition to the names, postal and e-mail address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain name. All of this info must be correct and up-to-date constantly; otherwise the domain registration could be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), so you must always make sure that the WHOIS details of your domain addresses are valid. Updating the WHOIS for numerous country-code TLDs is limited, so any time you register a brand new domain, you ought to double-check the information that you are submitting.