The so-called WHOIS details of each registered domain name include information regarding the registrar company, the registration and expiration dates, in addition to 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 retrieve this information through a command line or through one of the many sites which provide WHOIS lookup services. All contact details ought to be up-to-date as per the rules of ICANN, the Internet Corporation for Assigned Names and Numbers. If some of the information is not correct, the domain name can be reported and the result might be its removal or losing its ownership. Several country-specific domain extensions have certain limitations concerning the editing of their WHOIS details, but in the standard scenario any detail can be modified freely and at any time. Such a modification will show up on lookup sites within a day.