NETutility

NETutility is an application for Android ® that allows you in a few simple steps to plan the design of a LAN network from the point of view of the allocation of IP version 4.
It will be possible to test whether or not two hosts belong to the same network, know the address range that includes a specific IP after you put in input an Subnet Mask, split a network using VLSM and finally to interrogate a network through an Wi-Fi connection in search of all connected devices and active so as to obtain a complete overview of an existing network.
NETutility is for all: for the curious, for networking professionals looking for a handy tool to speed up the calculations at the design stage and also to students who wish to test their knowledge.

At this link you can find a guide in Italian:

http://openinglab.altervista.org/olab/software/netutility.html