The so-called WHOIS details of any registered domain name include details about the registrar company, the registration and expiration dates, and also 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 allows you to get all of this info either through a command line or using one of the numerous websites that provide WHOIS lookup services. All contact details ought to be up-to-date in line with the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the information is not correct, the internet domain might be reported and the result may be its removal or losing its ownership. A number of country-specific internet domain extensions have certain limitations for the modification of their WHOIS information, but in the general scenario any detail can be modified easily and at any time. Such a change will appear on lookup websites within a day.