The so-called WHOIS details of each registered domain contain information about the registrar company, the registration and expiration dates, in addition to 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 enables you to retrieve all of this info through a command line or through one of the many sites that provide WHOIS lookup services. All details should be up-to-date in accordance with the policies of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the info is not correct, the domain could be reported and the result could be its deletion or losing its ownership. A few country-specific domain extensions have certain limitations in connection with the editing of their WHOIS info, but in the general situation any detail can be modified freely and at any moment. Such an adjustment will show up on lookup websites within a day.