The so-called WHOIS details of every registered domain contain details about the registrar company, the registration and expiration dates, in addition to the names, phone number, postal address and e-mail address of the owner, the administrator and the tech/billing person. WHOIS is a special protocol that permits you to obtain this info through a command line or via one of the many websites which provide WHOIS lookup services. All info ought to 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 correct, the domain can be reported and the result might be its deletion or losing its ownership. Several country-specific internet domain extensions have certain limitations for the modification of their WHOIS info, but in the typical case any detail can be edited freely and at any moment. Such a change will show up on lookup websites within a day.