Calculate the subnet mask, wildcard, network ID, host range, broadcast addresses and more with an IPv4 address and CIDR mask.

Dynamically generate FLSM subnets to meet your host requirements. View detailed subnet information for each one.

Instantly generate VLSM subnets to meet your custom host requirements and maximize your available address space.

Dig deeper into your subnets by displaying binary addresses with just a rotation of your device.

Store and retrieve your subnets for later use across all three calculator modes.

Designed from the ground up for iOS. Full support for landscape and dark mode.