Who’s listening

When you want to find out what port is that service running on there’s a nice command to help you.

It’s called netstat and it’s available on Windows and Linux.

Here’s a couple of usage examples:

  • Find who’s connected to your port 25 (Usually SMTP Server).
  • Windows: netstat -ano | findstr :25 | findstr ESTABLISHED
  • Linux: netstat -ano | grep :25 | grep ESTABLISHED
  • Find what port’s are listening.
  • Windows: netstat -ano |  findstr LISTENING
  • Linux: netstat -ano | grep LISTENING

You can use multiple combinations of this command with regular expression filters to get what you need. This is a great tool to find what ports are being used and from where.


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