The WHOIS information of a domain is a collection of many details which are freely accessed via special lookup websites or a command line. The protocol that makes this possible bears the same name and you may very easily see the organization through which a domain address has been registered, the creation, expiration and last update dates together with the names, postal and e-mail address of those listed as Registrant (owner), Administrative, Technical and Billing contacts for a specific domain address. All of this info must be legitimate 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), so you must always ensure that the WHOIS details of your domain names are legitimate. Updating the WHOIS for a number of country-code TLDs is limited, so any time you register a completely new domain name, it is best to double-check the info that you're submitting.