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If you happen to want to only display the established connections (meaning they are actively communicating and a link has been established between the local machine and an outside IP), you can use this command variation of the aforementioned lsof string: Listing Only Established Internet Connections In the above lsof output display there’s nothing unusual, but in my aforementioned network troubleshooting, I discovered a BitTorrent client running hidden in the background of one of my networks Macs, and it was seeding several large files! Naturally I killed the BitTorrent client, removed the application, deleted the files, and the Mac LAN is running at full speed again. ITunes 644 macuser 21u IPv4 0x05f2f2a4 0t0 TCP *:daap (LISTEN) SystemUIS 93 macuser 10u IPv4 0x04db26e0 0t0 UDP *:* SystemUIS 93 macuser 6u IPv4 0x04db27bc 0t0 UDP *:* Here’s an example of the output displayed by this lsof -i command string:ĬOMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME Output of lsof is a little busy but if you’re familiar with the command line it shouldn’t be anything too crazy looking. You shouldn’t need to use sudo but you can if desired or required for your specific use case. I logged into the offending Mac and typed the following command:

This must be entered from the Terminal of OS X, but it can be used remotely with SSH or locally on a Mac.

Display a List of All Open Internet Connections in OS X from the Command Line