IPv4 Subnet Calculator

Calculate subnet mask, network address, broadcast address, and host range from CIDR notation.

Runs entirely in your browser — nothing is uploaded or stored on any server.

About IPv4 Subnet Calculator

Updated Mar 2025

Enter an IPv4 address with CIDR prefix (e.g., 192.168.1.0/24) and get the complete subnet breakdown: subnet mask, network address, broadcast address, first and last usable host addresses, total hosts, and usable hosts. Includes a visual binary representation of the subnet mask.

Frequently Asked Questions

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