How to Check and Identify Which Application is Listening or Opening Port 80 and 443 on Windows

Open Command Prompt window by typing Cmd in Run command box or Start Search, and hit Enter.

Type in the following netstat command:

netstat -o -n -a | findstr 0.0:80

or

netstat -o -n -a | findstr 0.0:443

or simply,

netstat -aon

Note: The last command will list all connection that is listening, established, starting, closing and all other states, so the list is long, and user has to manually search for rows that has connection originating or targeting to 1270.0.1:80/443 or 0.0.0.0.80/443.

The following line(s) of results should be returned:

TCP  0.0.0.0:80 0.0.0.0:0 LISTENING 8704

The last column of each row is the process identified (process ID or PID).

Identify which process or application is using the port by matching the PID against PID number in Task Manager.