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

User · Answer

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

User · Answer

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

User · Answer

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

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

User · Answer

TCPView can do what you asked for

User · Answer

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

User · Answer

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   gt netstat -ano  Active Connections    Proto  Local Address          Foreign Address        State           PID         TCP         49335                  0                 LISTENING       1056        C   gt tasklist  fi  pid eq 1056   Image Name                     PID Session Name        Session     Mem Usage                                                                              sqlservr exe                  1056 Services                   0     66 192 K

User · Answer

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

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

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

User · Answer

netstat -natp  is what I always use

User · Answer

Open Ports Scanner works for me

[windows] What port is a given program using?

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