Subnet Calculator

Enter an IPv4 address and CIDR prefix to see network boundaries, usable hosts, wildcard mask, and binary mask.

IPv4 address

CIDR prefix or mask

Split prefix (optional)

—Network

—Broadcast

—Subnet mask

—Wildcard mask

—First usable

—Last usable

—Total addresses

—Usable hosts

ReadyIPv4 subnet calculation runs entirely in your browser.

How to use this Subnet Calculator

Calculate IPv4 network, broadcast, host range, subnet mask, and CIDR details. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.