The so-called WHOIS details of each registered domain include info about the registrar firm, the registration and expiration dates, and also the names, phone 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 obtain all this info through a command line or by using one of the many websites which provide WHOIS lookup services. All contact 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 information is not legitimate, the domain name may be reported and the result may be its deletion or losing its ownership. A number of country-specific domain address extensions have specific limitations concerning the modification of their WHOIS information, but in the typical scenario any detail can be modified freely and at any moment. Such an adjustment will show up on lookup sites within a day.