What port is a given program using? [closed]

Question

I want to be able to figure out what port a particular program is using. Are there any programs available online or that come with windows that will tell me which processes are using which ports on my computer?

PS - before you downmod this for not being a programming question, I'm looking for the program to test some networking code.

Answer 1

At a command line, netstat -a will give you lots o' info.

Answer 2

Windows comes with the netstat utility, which should do exactly what you want.

Answer 3

"netstat -natp" is what I always use.

Answer 4

Windows 8 (and likely 7 + Vista) also provide a view in Resource Monitor. If you select the Network tab, there's a section called 'Listening Ports'. Can sort by port number, and see which process is using it.

Answer 5

You may already have Process Explorer (from Sysinternals, now part of Microsoft) installed. If not, go ahead and install it now -- it's just that cool.

In Process Explorer: locate the process in question, right-click and select the TCP/IP tab. It will even show you, for each socket, a stack trace representing the code that opened that socket.

Answer 6

Open Ports Scanner works for me.