Subnetting!
A useful application that works quite well, it did crash to desktop when I first got it but a restart of the device helped and its worked flawless ever since.
To the review below, its a subnet calculator, if you dont know what subnetting is, then this app will be complete confusing to you. It has nothing to do with the IP your iPhone or iPod touch is using, its used to calculate the appropriate subnet when setting up a network.
Daphoid about
aSubnet