Without a doubt the single best networkers tool that Ive found on the App Store. This is one of the very rare tools on the App Store that is legitimately a Network Engineers testing tool.
While many other apps are confined to simple scanning, ICMP, or DNS functionality, Net-Toolbox provides a set of tools that are *actually useful* for testing and securing networks.
L301001 about Network Toolbox Net security, v9.02.02