Port scanning is a network security technique used to discover open ports on a target IP address. An open port is a communication endpoint on a computer or network device that is listening for incoming connections. Port scanning can be used to identify potential security vulnerabilities and to troubleshoot network connectivity issues.
There are a number of different ways to check whether a port is open. One common method is to use a port scanner, which is a software tool that scans a range of ports on a target IP address and reports which ports are open. Another method is to use the netstat command, which is a command-line tool that can be used to view the status of network connections.
