The so-called WHOIS details of each registered domain name include information about the registrar company, the registration and expiration dates, plus the names, telephone 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 get this info through a command line or by using one of the many Internet websites which provide WHOIS lookup services. All info ought to 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 accurate, the domain could be reported and the result could be its deletion or losing its ownership. Some country-specific domain name extensions have specific limitations concerning the modification of their WHOIS details, but in the standard situation any detail can be edited openly and at any moment. Such a modification will appear on lookup websites within twenty four hours.