Subnet Calculator

Subnet Calculator is a simple, fast, flat-design utility. No accounts, no clutter — just the tool you need.

Features
• Enter IP + CIDR prefix (/0 to /32)
• Network, broadcast and netmask
• First/last usable host + host count
• Wildcard mask included

Zero everything
• No login or account needed
• No location, camera, contacts or storage permissions
• Clean Material 3 flat design
• Works fully offline