The so-called WHOIS details of each registered domain name contain information about the registrar company, the registration and expiration dates, as well as the names, telephone number, postal address and e-mail address of the owner, the admin and the tech/billing person. WHOIS is a special protocol that allows you to retrieve all this information through a command line or using one of the numerous sites which provide WHOIS lookup services. All contact details ought to be up-to-date in accordance with the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the info is not correct, the domain may be reported and the result could be its removal or losing its ownership. A few country-specific internet domain extensions have certain limitations for the change of their WHOIS information, but in the standard scenario any detail can be modified easily and at any time. Such a modification will show up on lookup Internet sites within 24 hours.