To view a program that listens to a port in a Windows system

Netstat-aon | FINDSTR 80
Proto Local Address Foreign address State PID
==== ============ ============== ========== ======
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 1688
You can see that port 80 is occupied by a program with a process number of 1688.
tasklist | findstr 1688
Image name PID session name Session # Memory usage
========================= ====== ================ ======== ============
Inetinfo.exe 1688 Console 0 2,800 K
Obviously, Inetinfo occupies 80 ports; Inetinfo.exe is mainly used to support the debugging of Microsoft Windows IIS Network Services, which is very important for the normal operation of your system.
Taskkill/pid 1688/f
Success: The process with PID 1688 has been terminated.

To view a program that listens to a port in a Windows system