The so-called WHOIS details of every registered domain name contain information regarding the registrar firm, the registration and expiration dates, along with 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 lets you get all this information either through a command line or by using one of the numerous sites that offer WHOIS lookup services. All details should be up-to-date as per the regulations of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the details are not correct, the domain name might be reported and the result might be its deletion or losing its ownership. Some country-specific domain name extensions have certain limitations in connection with the modification of their WHOIS details, but in the standard situation any detail can be modified easily and at any moment. Such an adjustment will show up on lookup websites within a day.