check used ports code example

Example 1: check which application is using port

In Windows CMD/Powershell:
netstat -aon | findstr '[port_number]'

Example 2: see what ports are in use

Get-Process -Id (Get-NetTCPConnection -LocalPort portNumber).OwningProcess

Example 3: how to check listening ports on a server

sudo ss -tulwn | grep LISTEN