Finding application that is utilizing which network port

Ever encounter the situation where you need to find out which application is currently utilizing the port. You can do this with just tools that came with Microsoft Windows.

Open the command prompt and issue the netstat command

Start > Run > cmd > netstat -ano

netstat -ano

netstat -ano

Then you would see the ports being used and the Process ID (PID) associated to it

Open the Task Manager and match the PID to the application which is using it. The PID column might not be visible by default, you can enable the column by

Windows Task Manager > View > Select Columns… > PID (Process Identifier) > OK

Task Manager PID option

Task Manager PID option

Task Manager with PID Column

Task Manager with PID Column

After Windows XP SP2, the command line parameter -b was which displays the executable involved in creating each connection or listening port. In some cases well-known executables host multiple independent components, and in these cases the sequence of components involved in creating the connection or listening port is displayed. In this case the executable name is in [] at the bottom, on top is the component it called, and so forth until TCP/IP was reached. Note that this option can be time-consuming and will fail unless you have sufficient permissions.

Start > Run > cmd > netstat -anob

netstat -anob

netstat -anob show the application utilizing the port


Microsoft Netstat : [LINK]

July 15, 2011 | Filed Under Network 
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