How to: Identify which application is listening or opening a specific port on Windows

  1. Open Command Prompt window by typing Cmd in Run command box or Start Search, and hit Enter.
  2. Type in the following netstat command:


netstat -o -n -a | findstr :80


netstat -aon | findstr :443


Where the text after findstr is the text you want to find in the list of netstat. For example, in the first one you´ll find who has the port 80 open while on the second one you´ll find who is listening on port 443.

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