2. Enter the netstat -an command in the cmd dialog box that appears. You can see the usage of the port.

3. You can also directly check whether a specific port number is occupied, and enter the following command: netstat -aon|findstr "port number ". For example, check the usage of port 80: netstat -aon|findstr "80 ".

4. Of course, the netstat command is more than that. If you want to know more about the usage of netstat, you can enter the netstat -help command.