View the computer port status

1. The computer port is the outlet for communication between the computer and the outside world,
2. Run the netstat command in Windows to check the port opened on the machine. Go to the command line and use the parameters a and N of the netstat command. The result is as follows:
C:/> netstat-
Active connections
PROTO local address foreign address State
TCP 0.0.0.0: 80 0.0.0.0: 0 listening
TCP 0.0.0.0: 21 0.0.0.0: 0 listening
TCP 0.0.0.0: 7626 0.0.0.0: 0 listening
UDP 0.0.0.0: 445 0.0.0.0: 0
UDP 0.0.0.0: 1046 0.0.0.0: 0
UDP 0.0.0.0: 1047 0.0.0.0: 0
Active connections refers to the active connection of the local machine, and proto refers to the protocol name used for the connection. Local address is the IP address of the Local Computer and the port number being used for the connection, foreign address is the IP address and port number of the remote computer connected to this port, and State indicates the TCP connection status.