The so-called WHOIS details of every single registered domain contain details about the registrar company, the registration and expiration dates, plus the names, telephone number, postal address and email address of the owner, the admin and the tech/billing person. WHOIS is a specific protocol that allows you to obtain all this information either through a command line or via one of the numerous sites which provide WHOIS lookup services. All contact details should be up-to-date as per the regulations of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the info is not legitimate, the internet domain could be reported and the result may be its deletion or losing its ownership. A few country-specific domain address extensions have certain limitations regarding the editing of their WHOIS info, but in the standard case any detail can be changed openly and at any time. Such an adjustment will show up on lookup sites within a day.