The so-called WHOIS details of any registered domain name include details about the registrar firm, the registration and expiration dates, plus the names, phone number, postal address and email address of the owner, the administrator 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 through one of the numerous Internet websites that offer WHOIS lookup services. All details must be up-to-date in accordance with the policies of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the details are not correct, the domain might be reported and the result may be its removal or losing its ownership. Several country-specific domain name extensions have specific limitations for the modification of their WHOIS information, but in the general case any detail can be changed freely and at any time. Such a change will show up on lookup sites within a day.