identifying the program listening at a port

[Ben Beuchler <insyte@emt-p.org>]

nmap is showing me a couple of odd ports open on one of my boxes.  These
ports are not listed in /etc/services and I don't seem to have anything
unexpected in my process table...

Anyone know of a program that will identify which app/pid/whatever is
listening at a specified port?

Thanks,
Ben

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