About IP Subnet Calculator
An IP subnet calculator determines the network address, broadcast address, host range, and other details from an IP address and subnet mask or CIDR prefix length. Subnetting divides a large network into smaller, more manageable sub-networks. This tool supports CIDR notation (/0 to /32) and displays all essential subnet information.
How to Use
Enter an IPv4 address (e.g., 192.168.1.100) and select a CIDR prefix length (e.g., /24) using the slider. The tool instantly calculates the network address, broadcast address, subnet mask, wildcard mask, first and last usable host addresses, and total number of hosts. Copy any result with one click.
Common Use Cases
- •Planning IP address allocation for network segments
- •Configuring firewall rules with correct subnet masks
- •Determining usable host ranges for DHCP configuration
- •Troubleshooting network connectivity and routing issues
- •Studying for network certification exams (CCNA, CompTIA Network+)