openbsm-logo has posted yet another tutorial on how to see what programs are listed on a certain port on FreeBSD.

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?

Tutorial details
Difficulty Easy (rss)
Root privileges Yes
Requirements none
Estimated completion time 5m

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.

  • netstat command – Use to see network status including open ports, tcp/udp connections, and more.
  • sockstat command – Show open sockets.
  • lsof command – List open files such as network sockets and files on disks.

FreeBSD has a command called sockstat and netstat tools. These are already on a standard FreeBSD install. You need to install the lsof tool from ports collection.

View the full tutorial here: http://www.cyberciti.biz/faq/freebsd-unix-find-the-process-pid-listening-on-a-certain-port-commands/