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

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up vote 13 down vote accepted

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

If you are interested in a specific port, you can use this example:

lsof -i 4tcp:8080 -sTCP:LISTEN

If you would only like to get the process id, you can run this:

lsof -i 4tcp:8080 -sTCP:LISTEN -Fp
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The following code example lists all running TCP servers on your local OSX machine:

netstat -a -Ptcp | egrep 'tcp4.*LISTEN'

tcp4       0      0         *.*                    LISTEN               0          0
tcp4       0      0  *.3141                 *.*                    LISTEN               0          0

LISTEN shows only sockets listening for connections. That is, servers.

The first line shows a server bound to localhost, aka, port 2022. It will answer to local requests, but not Internet-based requests.

The second line is a server bound to all addresses, ie *, port 3141. It will answer Internet queries.

To list ports used by clients and servers, use the following:

netstat -an -Ptcp | grep tcp4
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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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