The only person who can know whether the domain is "used" for an actual web site, is the owner of the domain. The reason why, is because you have to define wha

The only person who can know whether the domain is "used" for an actual web site, is the owner of the domain. The reason why, is because you have to define what "used" means. Only the owner of the domain can set up a public DNS entry for that domain. But he can also set up a private DNS entry for that domain, or a public DNS entry with a private IP address. For example, lassell.lan.informatimago.com is a public DNS entry, with a private IP address. Can you know whether there's an actual website on this domain? Then of course, you would have to know what an actual web site is! Is http://hubble.informatimago.com:8117 http://hubble.informatimago.com:8117 an actual website? What if I activated the web server only for 2 seconds after receiving a specific packet on a specific port?