CurrPorts will show you a detailed list of all currently opened TCP/IP and UDP ports on your PC, it will tell you the process name, the protocol being used (TCP/UDP), local port, remote port, remote IP being connected to and much more.
Currports is a very complete network monitoring software that easily beats Windows Task Manager, this free alternative to Windows Task Manager gives you exhaustive information about the applications running in your computer and allows you kill the processes that opened the ports as well as exporting all of the network activities data to a text or HTML file.
CurrPorts free network monitoring software
Another feature of this port monitoring tool is that it will automatically highlight in pink colour suspicious TCP/UDP ports opened by unknown applications, filters and command line are also available.