Whois Test
WHOIS is a TCP-based query/response protocol which is widely used for querying a
database in order to determine the owner of a domain name, an IP address, or an
autonomous system number on the Internet. WHOIS lookups were traditionally made
using a command line interface, but a number of simplified web-based tools now
exist for looking up domain ownership details from different databases. Web-based
WHOIS clients still rely on the WHOIS protocol to connect to a WHOIS server
and do lookups, and command-line WHOIS clients are still quite widely used by
system administrators...
[see Wikipedia]