The so-called WHOIS details of each registered domain include details about the registrar organization, the registration and expiration dates, and also the names, telephone number, postal address and e-mail address of the owner, the admin and the tech/billing person. WHOIS is a special protocol that allows you to obtain all of this info either through a command line or using one of the many websites that provide WHOIS lookup services. All information 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 legitimate, the domain name could be reported and the result might be its deletion or losing its ownership. Some country-specific domain extensions have certain limitations regarding the editing of their WHOIS information, but in the general case any detail can be changed openly and at any moment. Such a change will show up on lookup sites within 24 hours.