The WHOIS info of a domain name is a collection of many details which are freely accessed using special lookup sites or a command line. The protocol which makes this possible has the same name and you may easily see the firm where an Internet domain has been registered, the creation, expiration and last update dates as well as the names, postal and email address of the individuals listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain address. This info ought to be legitimate and up-to-date all the time; if not the domain registration may be challenged. The latter is a policy of ICANN (the Internet Corporation for Assigned Names and Numbers), therefore you should always ensure that the WHOIS details of your domain addresses are legitimate. Updating the WHOIS for several country-code TLDs is limited, so whenever you register a completely new Internet domain, it is best to double-check the information that you are submitting.