SHOUTcast is a multiplatform freeware audio streaming technology, developed by Nullsoft. SHOUTcast uses MP3 or AAC encoding of audio content and HTTP (though multicast can be used) as the transport protocol to broadcast web radio, also known as Internet radio. Both servers and clients are available for Windows, FreeBSD, GNU/Linux, Mac OS X, Solaris and Windows Mobile (client only).

SHOUTcast software allows users to set up their own Internet radio servers using provided software. The output format is supported by multiple clients including the widely popular Nullsoft Winamp, VLC media player, XMMS, Zinf and Apple iTunes. Using the software, users may set up radio servers for their own needs. Current uses include listening to music, watching video and listening to live events.

To scan a server enter the server's data in the form and press Continue. Make sure you have entered the right Queryport since this Information is more valuable for Nanospy than the Gameport.
Read more about this in the FAQ