The WHOIS information of an domain name is a collection of various details that are openly accessed using specific lookup websites or a command line. The protocol which makes this possible bears the same name and you could very easily see the organization through which a domain address has been registered, the creation, expiration and last update dates as well as the names, postal and e-mail address of the people listed as Registrant (owner), Administrative, Technical and Billing contacts for a particular domain. This information ought to be correct and up-to-date at all times; 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 ensure that the WHOIS details of your domain names are accurate. Updating the WHOIS for numerous country-code TLDs is limited, so any time you register a new domain address, it is best to double-check the info that you are submitting.