How can I tell which processes have opened which TCP/UDP ports?

Elementary my dear Watson. Simply run the netstat –ano command followed by the tasklist command, and match up the process ID’s (PID’s).

Let me show you. Here are all the open ports on my PC:


And here are the matching processes in memory:


So all you need to do is match the PID field from both outputs, and you’re done!

Regards

Paul Eddington

KB Keywords: TCP, UDP, port, firewall, process, TCP/IP, stack, OSI.