Checking used port/application in windows command

Checking which application is using a port:

• Open the command prompt
• Type netstat -aon | findstr [port_number]
• If the port is being used by any application, then that application’s detail will be shown. The last column of the list, is the PID of that application. Take a note of the PID.
• Type tasklist | findstr [PID]
• You’ll be shown the application name that is using your port number.

Checking which port is being used by a application:

Exactly the reverse of the above steps.

• Open the command prompt
• Type tasklist | findstr [application_name]
• Make note of the PID (second column) from the details shown.
• Type netstat -aon | findstr '[PID]'
• You’ll be shown the application detail and the corresponding port to which it is listening.