Universal Plug-and-Play Tester Version 2 descriptions UPnP Tester is an experhymental tool which lists all the available devices compatible with the Universal Plug-and-Play protocol including Internet Gateway Devices . As soon as the program starts it searches for available devices then it updates the list as devices are plugged or unplugged. The status window displays miscellaneous notifications & the IP addresses as they are assigned. You can also select a device or a service from the list & click Properties. . . to get some information about it or to query a service. In the properties double-click any URL to open it in your default browser.