The so-called WHOIS details of every single registered domain contain info about the registrar company, the registration and expiration dates, in addition to the names, telephone number, postal address and email address of the owner, the admin and the tech/billing person. WHOIS is a special protocol that allows you to get all of this information through a command line or by using one of the numerous websites that offer WHOIS lookup services. All contact details must be up-to-date in line 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. Several country-specific domain extensions have certain limitations for the modification of their WHOIS info, but in the standard situation any detail can be modified freely and at any moment. Such an adjustment will appear on lookup sites within 1 day.