This is my latest Android App and the first to be published in Google Play. The App provides you with basic information about any unicast IPv4 address you enter, including: the network id portion of the IP address given the mask length, the number of usable host IP addresses within the network, and the first, last and broadcast addresses within the network.
You can use the IP Address Calculator at work or in school to determine quickly how to segment an IPv4 network address using a 32-bit mask. The App also provide with notes about the IP address you enter, such as if the address is Private address according to RFC 1918. The information generated by this app can be shared as text with other apps such as email apps or word processors in your phone or tablet.
Download the app here.