The so-called WHOIS details of every single registered domain contain information about the registrar firm, the registration and expiration dates, plus 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 permits you to get all this information through a command line or by using one of the numerous sites which provide WHOIS lookup services. All contact details ought to be up-to-date as per the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the information is not correct, the domain may be reported and the result could be its deletion or losing its ownership. Several country-specific internet domain extensions have specific limitations for the modification of their WHOIS information, but in the standard scenario any detail can be changed freely and at any moment. Such a change will show up on lookup Internet sites within 1 day.