This app helps subnet design and makes list of networks/subnets.

You can look for good subnet mask easily because this app shows the below information.

- Number of networks
- Number of host addresses for each

The list of networks is made when IP address and masks are entered. Characteristic (Subnet Zero, All-Ones Subnet, Super net) of networks is indicated with icons on list of networks. Sliders for masks and keypad for IP address helps quick entry.