Planet WDRT-1200AC User Manual page 67

 UPnP Portmap Table:
Only applications supporting the UPnP protocol may use this function.
Your operating systems and application software should support UPnP, such as
Windows XP, Windows Vista and Windows 7.
The default value for the advertisement time to live is 4 hops, which
should be fine for most home networks. If you notice that some devices
are not being updated or reached correctly, then it may be necessary to
increase this value a little.
The table shows the IP addresses of all current UPnP devices
accessing the router, and the opened ports (internal and external) of
such devices.
The UPnP Port Mapping Table displays the IP address of each UPnP
device that is currently accessing the router and which ports (Internal
and External) that device has opened. The UPnP Port Mapping Table
also displays what type of port is opened and if that port is still active for
each IP address.
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User Manual of WDRT-1200AC