If youre unfamiliar with networking tools like this, you can think of nettop as a network centric task manager, displaying active networking connections, sockets and routes, their respective names and process id, the state of the connection and whether the connection is established, waiting, or listening, and information about individual process data transfer.

Its a bit like the standard top and htop commands which show process and resource information, but rather than showing CPU and RAM usage, it will show live network transfer information like packets sent and received, packet size, and total data transferred.

Netuse Traffic Monitor Free Mac App

Command line tools arent for everyone though, and for users who would like to view similar network information in a more traditional OS X app format, the free Mac app Private Eye is an excellent GUI tool that provides similar information.

Open Terminal from ApplicationsUtilities, and at the command prompt, type nettop to immediately see active network connections and traffic.

Hitting the p button to put the output displayed by nettop into human readable format is also very helpful for most of us.

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If you have a traffic cap on your Internet usage, NetUse will help make sure you dont exceed your limits.

We also showed you how to allow apps to communicate through it.

If all you want to do is stop incoming requests, with a few exceptions, that should do the trick.

This is where Private Eye comes in handy: open this application and you can watch every request in real time, and see which addresses sites are connecting to.

Click the big blue Download button, and youll see the PKG file in your Downloads folder.

Every time an application makes a request, youll see the name of the application and which addresses they connected to.

This is a tool for spotting patterns in real time, not creating a massive log you can browse later.

For example, heres online backup program Backblaze doing its thing.

On mine, for example, Bittorrent Sync (now called Resilio Sync) was the only application accepting requests, which makes sense.

If something looks suspicious, Google the application name and see what you find.

Most of the time youll learn its part of macOS, or related to an applications youve installed.

Remember: dont freak out just because an app phones home its often with good reason.

Occasionally, though, you might find something malicious, and its time to remove some malware from your Mac.

If youre more interested in how much data applications are using, we recommend you check out Activity Monitor, in particular the Network tab.

He also runs the Hillsboro Signal, a volunteer-driven local news outlet he founded.

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