The so-called WHOIS details of each registered domain name contain information regarding the registrar company, the registration and expiration dates, plus the names, phone number, postal address and email address of the owner, the admin and the tech/billing person. WHOIS is a specific protocol that allows you to obtain all of this info through a command line or by using one of the many websites that provide WHOIS lookup services. All information ought to be up-to-date in accordance with the policies of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the information is not accurate, the domain address might be reported and the result could be its removal or losing its ownership. Some country-specific domain address extensions have specific limitations for the change of their WHOIS info, but in the general case any detail can be changed freely and at any time. Such a change will appear on lookup Internet sites within a day.