Monitor Network Connections in Mac OS X for Free with Private Eye
Private Eye is a free real-time network monitor app for Mac OS X 10.7+ that is extremely easy to use. Launching the app, you’ll start to see all open network connections, and you can then filter connections by app, monitor all open connections, or watch only incoming or outgoing transfer.
Connections are reported by application, the time of the connection, and arguably the most useful, the IP address that is being connected to by the app. If you have any interest in networking, security, or you just want to keep an eye on what apps are connecting to the internet and to where, you should download this app.
- Download Private Eye now (direct link) or visit the developers home
This is a simple yet powerful tool without the complexity or the learning curves related to compiling and using the command line tools lsof, watch, open_ports, or wireshark. Highly recommended.
There’s LittleSnitch, of course; not free, but oh so powerful because it actually asks permission before allowing an app to reach out, which you can deny, of course. It’s not cheap –$30–but an app built by the same guy who built LaunchBar rocks in my world.
I downloaded Private Eye, though. It’s elegant for the beginning curious who will quickly want something more powerful. Maybe by this obviously talented developer?
Very nice app, thanks!
Also Net Monitor and Net Monitor Sidekick are worth a look. While not free they prrovide much more information, including the ability to right click a connection and do a trace route. I did look at Private eye and unless you are paranoid about what your computer is doing it is a very nice program.
And I agree with the previous poster about Little Snitch. I have been running it for years. I like the ability to approve a connection until you quit the program. (I am parranoid about what my computer does. I run a second monitor with nothing but network monitoring software).
I wouldn’t trust Private Eye because it does not display connections initiated by apps written in Java. I wrote the developers and they acknowledged it’s a known issue.
If it doesn’t understand Java, who knows what else it doesn’t display?
Doesn’t catch a good deal of network activity.
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