Port Authority is described as 'Fast Android port scanner providing network information and quick host discovery. Designed for systems and network security with real-time insights' and is a IP Scanner in the network & admin category. There are more than 50 alternatives to Port Authority for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Port Authority alternative is Nmap, which is both free and Open Source. Other great apps like Port Authority are Angry IP Scanner, Fing, Zenmap and NetPeek.