CMD

  1. Get the PID of running process: netstat -a -n -o | find "{PORT_NUMBER}"
    tip: {PORT_NUMBER} is the port number you want to lookup
  2. Get the running task/process details by PID: tasklist /fi "pid eq {PID}"
    tip: {PID} is the pid coming form list at previous point

Powershell

Get-Process -Id (Get-NetTCPConnection -LocalPort {PORT_NUMBER}).OwningProcess
tip: {PORT_NUMBER} is the port number you want to lookup