Great App for planning out subnets when planning your network
iPhone version:
https://itunes.apple.com/us/app/ipv4-net-planner-mobile/id626517290?ls=1&mt=8
iPad version:
https://itunes.apple.com/us/app/ipv4-net-planner/id622188943?ls=1&mt=8
iPhone version:
https://itunes.apple.com/us/app/ipv4-net-planner-mobile/id626517290?ls=1&mt=8
iPad version:
https://itunes.apple.com/us/app/ipv4-net-planner/id622188943?ls=1&mt=8