The so-called WHOIS details of every registered domain name contain information about the registrar firm, the registration and expiration dates, and also the names, telephone number, postal address and email address of the owner, the admin and the tech/billing person. WHOIS is a special protocol that lets you obtain this information either through a command line or via one of the numerous sites that provide WHOIS lookup services. All details should be up-to-date as per the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the details are not accurate, the domain may be reported and the result might be its deletion or losing its ownership. A few country-specific internet domain extensions have certain limitations regarding the modification of their WHOIS information, but in the general case any detail can be modified openly and at any moment. Such a modification will appear on lookup Internet sites within a day.