IPtraf-ng is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is Glances, which is both free and Open Source. If that doesn't work for you, our users have ranked nine alternatives to IPtraf-ng, but unfortunately only two of them are available for Mac. If you can't find an alternative you can try to filter for web or SaaS options.
Glances is a cross-platform monitoring tool which aims to present a large amount of monitoring information through a curses or Web based interface. The information dynamically adapts depending on the size of the user interface.
NTop is a hybrid layer 2 / layer 3 network monitor, that is by default it uses the layer 2 Media Access Control (MAC) addresses AND the layer 3 tcp/ip addresses. ntop is capable of associating the two, so that ip and non-ip traffic (e.g.