IP Subnet Calculator

About IP Subnet Calculator

How to use IP Subnet Calculator

1. Enter an IPv4 address with CIDR notation (e.g., 192.168.1.0/24) into the input field. Subnet mask format (e.g., 192.168.1.0 255.255.255.0) and bare IP addresses (treated as /32) are also supported.
2. Calculation results including network address, broadcast address, usable host range, wildcard mask, IP class, and private/public status are displayed instantly as you type.
3. Use the quick-select buttons (/8, /16, /24, /28, /30, /32) for common prefix lengths. Click the copy button next to any result to copy values to your clipboard for configuration and documentation.
4. View binary representation of IP addresses and subnet masks for detailed analysis. The CIDR reference table displays all prefixes (/0 to /32) with corresponding masks and host counts, useful for learning and network design.

Benefits of IP Subnet Calculator

• [Full Browser Processing] All calculations run instantly in your browser. No IP address data is ever sent to a server, making it safe to use for confidential network planning tasks.
• [Real-Time Calculation] All fields are computed automatically as you type, eliminating manual calculations and spreadsheet conversions. This greatly improves efficiency for ACL configuration, firewall rule design, and VPN tunnel planning.
• [Comprehensive Information] Network address, broadcast, host range, wildcard mask, IP class detection, private/public identification, binary representation, and CIDR reference table — everything needed for subnet calculations on one screen.