The so-called WHOIS details of any registered domain contain details about the registrar firm, the registration and expiration dates, in addition to the names, telephone number, postal address and e-mail address of the owner, the admin and the tech/billing person. WHOIS is a specific protocol that lets you retrieve all of this info either through a command line or by using one of the numerous sites which provide WHOIS lookup services. All information ought to be up-to-date as per the policies of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the info is not accurate, the domain name can be reported and the result may be its deletion or losing its ownership. A number of country-specific domain extensions have certain limitations regarding the change of their WHOIS details, but in the general case any detail can be modified easily and at any time. Such a modification will appear on lookup sites within a day.