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FreeBSD Unix Find Out Which Programs Are Listing On a Given Port Number

I’m a new FreeBSD Unix system user. How can I find out the process/programs names listing on a certain port on a FreeBSD Unix systems using command line? How do I lookup the process which is currently bound to the given network port on a FreeBSD server?

You can use any one of the following command-line tools that displays network connections, routing tables, and a number of network interface statistics on a FreeBSD operating systems.

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