![]() Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name To list all TCP or UDP ports that are being listened on, including the services using the ports and the socket status use the following command: $ sudo netstat -tulnp Active Internet connections (only servers) This tool is very important and much useful for Linux network administrators as well as system administrators to monitor and troubleshoot their network-related problems and determine network traffic performance. Netstat ( network statistics) is a command line tool for monitoring network connections both incoming and outgoing as well as viewing routing tables, interface statistics etc. In general terms, an open port is a network port that accepts incoming packets from remote locations. Above all, open port is a network port on which an application or process listens on, acting as a communication endpoint.Įach listening port can be open or closed (filtered) using a firewall. Network port is identified by its number, the associated IP address, and type of the communication protocol, such as TCP or UDP. When troubleshooting network connectivity or application-specific issues, one of the first things to check should be what ports are actually in use on your system and which application is listening on a specific port. ![]()
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