The so-called WHOIS details of each registered domain contain details about the registrar company, the registration and expiration dates, plus the names, telephone number, postal address and e-mail address of the owner, the administrator and the tech/billing person. WHOIS is a specific protocol that lets you obtain all this information through a command line or via one of the many sites that offer WHOIS lookup services. All details must be up-to-date as per the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the info is not legitimate, the domain might be reported and the result may be its deletion or losing its ownership. Some country-specific domain address extensions have specific limitations concerning the change of their WHOIS information, but in the typical scenario any detail can be edited freely and at any moment. Such a change will appear on lookup sites within 1 day.