The so-called WHOIS details of any registered domain contain information about the registrar company, the registration and expiration dates, in addition to the names, phone number, postal address and email address of the owner, the administrator and the tech/billing person. WHOIS is a specific protocol that enables you to retrieve all this info through a command line or through one of the many Internet websites which provide WHOIS lookup services. All information ought to be up-to-date as per the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the details are not legitimate, the domain may be reported and the result might be its deletion or losing its ownership. A number of country-specific domain extensions have certain limitations concerning the change of their WHOIS information, but in the typical scenario any detail can be modified easily and at any time. Such a change will appear on lookup sites within 24 hours.