$ sudo netstat -tulpnįrom the output of the above command, the State column shows whether a port is in a listening state ( LISTEN) or not. It is also crucial to mention that netstat command has been deprecated and instead ss command has taken its place in showing more detailed network statistics. To list all open ports on a Linux system, you can use the netstat command or ss utility as follows. In this short article, we will show you how to list and monitor or watch running TCP and UDP ports in real-time with a socket summary on a Linux system. ![]() In software terms, especially at the operating system level, a port is a logical construct that identifies a specific process/application or a type of network service and each network service running on a Linux system uses a particular protocol (the most common being the TCP ( Transmission Control Protocol) and UDP ( User Datagram Protocol)) and a port number for communicating with other processes or services. Let’s start with the first command Netstat Command to Check Ports Listening on Linux The main command to check open ports on a Linux system is netstat.
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