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How do I see which processes have open TCP/IP ports in Mac OS X?

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One alternative is the use of the lsof utility; specifically, lsof -i 4tcp will list all processes with some sort of TCP IPv4 network sockets open. The manpage of lsof will provide you with detailed information on how to use the utility and how to interpret the output.

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Thanks, definitely the easiest to use – Zubair Feb 18 '10 at 11:12
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up vote 3 down vote

does wireshark work on os x?

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Yes it does work on OS X. – ayaz Feb 18 '10 at 11:02
+1 for not making a separate question out of this :-) – Cairo Feb 18 '10 at 15:12
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This should be possible in a terminal window using the Netstat command.

And if you like the GUI way more:

With Mac OS X 10.5, the /Applications/Utilities folder contains a network utility called: Network Utility, see tab Netstat for these stats presented in a gui application, along with Ping, Lookup, Traceroute, Whois, Finger and Port Scan.

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netstat on OS X has no options to list the processes sockets are attached to. – Steve Folly Feb 18 '10 at 23:35
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