IP Keypad - Subnet Calculator is a free iPhone app designed to assist with subnet calculations. With a dedicated keypad and pickers for subnet mask and prefix length, this app makes it easy to calculate network addresses, host addresses, and directed broadcasts. It offers both classful and classless modes, providing flexibility for different network configurations.

One of the standout features of IP Keypad - Subnet Calculator is its ability to show "Special-Purpose" information based on the RFCAprilin versionand later. This can be particularly useful for network administrators who need to identify special-use IP addresses.

Whether you're a network professional or simply someone who wants to understand subnetting better, IP Keypad - Subnet Calculator is a handy tool to have on your iPhone. It simplifies the subnetting process and provides accurate calculations, making it a valuable addition to the Business & Productivity category of apps.