Developer Tools
IP Subnet Calculator
🔒 Runs in your browser
Calculate subnet mask, network address, broadcast address, and usable host range from an IP address and CIDR prefix.
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How to Use an IP Subnet Calculator Free — CIDR & IPv4 (2026)
Calculate network address, broadcast address, usable host range, and host count for any IPv4 subnet in your browser. Supports CIDR and subnet mask input.