ntop is described as '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' and is a Network Monitor in the network & admin category. There are more than 25 alternatives to ntop for a variety of platforms, including Linux, Web-based, SaaS, Windows and Mac apps. The best ntop alternative is Datadog. It's not free, so if you're looking for a free alternative, you could try HyperDX or DeepFlow. Other great apps like ntop are ChaosSearch, iftop, Ubikute Relay and Cacti.