To check which ports are open on a computer, you can use a port scanner. A port scanner is a tool that sends requests to a range of ports on a computer and reports which ports are open. This information can be useful for troubleshooting network problems, identifying security vulnerabilities, and managing network traffic.
Port scanning is a common practice in network administration and security. It can be used to identify open ports that could be exploited by attackers. It can also be used to troubleshoot network problems, such as connectivity issues or slow performance.