Windows - How to know which program take a port ?

The management of the port with Windows.

When you install software, you need often to verify the available port in order to configure the component installation.

Download Tcpview and launch the .exe with the same name.

Just perform this instruction in a command dos.

netstat -ab | findstr ThePortNumber

Here below, we can see that Skype take the port 80 (http) or that googlewebaccclient the port 9100.

C:\Documents and Settings\Nicolas>netstat -ab
 
Active Connections
 
  Proto  Local Address          Foreign Address        State           PID
  TCP    NGERARD:http           NGERARD.nf.newfrontiers.nl:0  LISTENING       2804
  [Skype.exe]
  TCP    NGERARD:9100           NGERARD.nf.newfrontiers.nl:1526  LISTENING    3748
  [googlewebaccclient.exe]
  .....

With the options -b -v netstat determines which is PID is the originator of the port usage.