How to determine tcp port used by Windows process in C#

Question

Is there a managed class/method that would provide the TCP port number(s) used by a particular Windows processes?

I'm really looking for a .NET equivalent of the following CMD line:

netstat -ano |find /i "listening"

Rubens Farias · Accepted Answer · 2022-06-10 11:39:52Z

15

Except for PID, take a look this:

IPGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();

IPEndPoint[] endPoints = ipProperties.GetActiveTcpListeners();
TcpConnectionInformation[] tcpConnections = 
    ipProperties.GetActiveTcpConnections();

foreach (TcpConnectionInformation info in tcpConnections)
{
    Console.WriteLine("Local: {0}:{1}\nRemote: {2}:{3}\nState: {4}\n", 
        info.LocalEndPoint.Address, info.LocalEndPoint.Port,
        info.RemoteEndPoint.Address, info.RemoteEndPoint.Port,
        info.State.ToString());
}
Console.ReadLine();

Source: Netstat in C#

A bit more research bring this: Build your own netstat.exe with c#. This uses P/Invoke to call GetExtendedTcpTable and using same structure as netstat.

edited Jun 10, 2022 at 11:39

answered Nov 30, 2009 at 12:04

Rubens Farias

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4 Comments

Revious Over a year ago

And to get also the PID?

EddPorter Over a year ago

Link to "Build your own netstat" is broken. @Konamiman's comment has a working link: timvw.be/2007/09/09/build-your-own-netstatexe-with-c

user3625699 Over a year ago

@EddPorter Update: web.archive.org/web/20150520071202/http://www.timvw.be/2007/09/…

Mr. Squirrel.Downy Over a year ago

Site still online, just more a dot: timvw.be/2007/09/09/build-your-own-netstat.exe-with-c But it works with WinAPI

InteXX · Accepted Answer · 2020-07-19 02:04:48Z

2

See here for an equivalent of netstat in C#: http://towardsnext.wordpess.com/2009/02/09/netstat-in-c/

Update: Link is broken, but here's an equivalent: http://www.timvw.be/2007/09/09/build-your-own-netstatexe-with-c

Update: The original page has been archived at the Wayback Machine.

edited Jul 19, 2020 at 2:04

InteXX

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answered Nov 30, 2009 at 11:59

Konamiman

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2 Comments

Misaz Over a year ago

Page was not found :(

rakeshyadvanshi Over a year ago

here is working link timvw.be/2007/09/09/build-your-own-netstat.exe-with-c

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