The UPNP Mapper, or UPNP Router Port Mapping Tool, provides a set of tools to display and configure router related Universal Plug and Play settings. It does that by directly implementing the UPNP protocol with direct sockets meaning it does not rely on the operating system to provide the information but its own functions.

Probably the most interesting feature of the software program is the ability to scan the network for UPNP devices and display the port mapping info of those devices in its interface. UPNP Port Mapper can also map or unmap ports on a discovered device.

The tool was tested on Windows 2000, Windows XP and Windows Vista and should run fine on computers running those operating systems. The software is portable and uses a single executable file with a size of 204 Kilobytes. Some routers, especially older ones are reported to work incorrectly or not at all with that software which is usually caused by a faulty implementation of UPNP in the router.