check who is using port code example

Example 1: find out process using port windows

netstat -ano | findstr 8080

Example 2: check which application is using port

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

Example 3: see what ports are in use

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