The so-called WHOIS details of each registered domain name include details about the registrar firm, the registration and expiration dates, in addition to the names, contact number, postal address and e-mail address of the owner, the admin and the tech/billing person. WHOIS is a special protocol that enables you to retrieve all of this information either through a command line or via one of the numerous sites which provide WHOIS lookup services. All contact details must be up-to-date in accordance with the regulations of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the details are not correct, the internet domain can be reported and the result may be its deletion or losing its ownership. A number of country-specific domain address extensions have specific limitations regarding the change of their WHOIS details, but in the typical case any detail can be changed freely and at any moment. Such a change will show up on lookup Internet sites within a day.