What port is a given program using?

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.

Regardless of whether you're going to use this as part of some programming project, it's not a programming problem. — Lightness Races in Orbit, Jul 26 '11 at 00:21

score 149 · Accepted Answer · edited May 23 '17 at 12:02

149

netstat -b -a lists the ports in use and gives you the executable that's using each one. I believe you need to be in the administrator group to do this, and I don't know what security implications there are on Vista.

I usually add -n as well to make it a little faster, but adding -b can make it quite slow.

Edit: If you need more functionality than netstat provides, vasac suggests that you try TCPView.

edited May 23 '17 at 12:02

Community

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answered Sep 19 '08 at 20:41

Graeme Perrow

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If anybody has the rights to edit an answer, consider adding vasac's answer below (TCPView) for anybody that needs a more feature-full version of this with a real gui – AlexeyMK Sep 19 '08 at 20:48
I added the link to TCPView to my answer. – Graeme Perrow Sep 19 '08 at 21:06
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is there any way with firewall? – Mohammad Kermani Jul 07 '14 at 08:01
`-p` & `-b` options are unreliable, see my answer: https://superuser.com/questions/191416/pid-number-in-task-manager-cant-be-found/1639302#1639302 – gavenkoa Apr 04 '21 at 09:47

score 42 · Answer 2 · answered Sep 19 '08 at 20:45

42

TCPView can do what you asked for.

answered Sep 19 '08 at 20:45

vasac

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Thank you; netstat is more than enough for my needs but if I ever need something more hardcore I'll be sure to use TCPView. Should be added to the accepted answer but alas I don't have the right to Edit yet. – AlexeyMK Sep 19 '08 at 20:47
I've been using the Netstat utility that comes with XAMPP. But this standalone utility is much useful. Thanks. – Shiyaz Sep 13 '17 at 12:58

score 25 · Answer 3 · answered Sep 20 '08 at 00:00

On Vista, you do need elevated privileges to use the -b option with netstat. To get around that, you could run "netstat -ano" which will show all open ports along with the associated process id. You could then use tasklist to lookup which process has the corresponding id.

C:\>netstat -ano

Active Connections

  Proto  Local Address          Foreign Address        State           PID
  ...
  TCP    [::]:49335             [::]:0                 LISTENING       1056
  ...

C:\>tasklist /fi "pid eq 1056"

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
sqlservr.exe                  1056 Services                   0     66,192 K

score 13 · Answer 4 · answered Sep 19 '08 at 23:46

13

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.

answered Sep 19 '08 at 23:46

Adam Mitz

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Is there a way to do this without selecting a process? In case one wants to locate a process by port? – Anuraag Vaidya Jan 19 '21 at 08:40

score 7 · Answer 5 · answered Sep 19 '08 at 20:59

7

If your prefer a GUI interface CurrPorts is free and works with all versions of windows. Shows ports and what process has them open.

answered Sep 19 '08 at 20:59

ctcherry

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another good alternative. wow, didn't know this was such a popular subject :) – AlexeyMK Sep 19 '08 at 21:15

score 5 · Answer 6 · answered Sep 19 '08 at 20:48

5

"netstat -natp" is what I always use.

answered Sep 19 '08 at 20:48

Steve Baker

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score 4 · Answer 7 · answered Aug 03 '13 at 02:03

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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.

answered Aug 03 '13 at 02:03

Mikezx6r

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exactly what I needed, 10x! – soninob Sep 23 '19 at 14:28

score 3 · Answer 8 · answered Sep 19 '08 at 20:41

3

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

answered Sep 19 '08 at 20:41

Adam Rosenfield

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score 1 · Answer 9 · answered Sep 19 '08 at 20:41

1

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

answered Sep 19 '08 at 20:41

CodeRot

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I'd vote this up if I had any votes left. – UnkwnTech Sep 19 '08 at 20:42
-1: -a doesn't give process ID – CharlesB Jun 01 '11 at 16:01
@CharlesB It does if you add the `-o` option. – user207421 Aug 03 '13 at 02:19

score 1 · Answer 10 · answered Sep 19 '08 at 20:42

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You can use the 'netstat' command for this. There's a description of doing this sort of thing here.

answered Sep 19 '08 at 20:42

tkerwin

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score 0 · Answer 11 · answered Sep 19 '08 at 22:04

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Open Ports Scanner works for me.

answered Sep 19 '08 at 22:04

Arne Evertsson

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score -1 · Answer 12 · answered Sep 19 '08 at 20:41

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most decent firewall programs should allow you to access this information. I know that Agnitum OutpostPro Firewall does.

answered Sep 19 '08 at 20:41

Toby Mills

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What port is a given program using?

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