Subnet & CIDR Calculator

Compute host boundaries, usable ranges, masks, and network IDs.

Computational Status

Automatically analyze tool output and explain results in plain English

Configure Tool Params

IPv4 Address

CIDR Mask Prefix

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Learn more about how this tool works and standard configurations

CIDR (Classless Inter-Domain Routing) notation like /24 describes network size. /24 = 256 addresses.

A /24 subnet has 256 total addresses — 254 usable hosts (subtract network and broadcast).

Currently the calculator focuses on IPv4 subnet math. IPv6 support is coming soon.