UPNPScan

A tool that scans the LAN or a given address range for UPnP capable devices. This is done by sending M-SEARCH discovery packets to either the UPnP multicast address or to the specified ip range.

usage:
./upnpscan -m or ./upnpscan -t 192.168.1-20.*

Downloads
Version 0.4 source upnpscan-v0.4-src.tgz
Version 0.4 binary upnpscan-v0.4-win32.zip

Author
UPNPScan was developed by Patrik Karlsson.