IPv4 Subnet Calculator

An IPv4 Subnet Calculator computes all essential network parameters from an IP address and subnet mask or CIDR notation. It calculates network address, broadcast address, usable host range, wildcard mask, and provides binary representations for understanding network boundaries.

Our tool supports both subnet mask notation (255.255.255.0) and CIDR notation (/24), instantly calculating subnet details including the number of available hosts, network class, and whether the IP is in a private address range. Essential for network design and troubleshooting.

Subnetting is fundamental to network design but complex to calculate manually. Incorrect subnet calculations lead to IP conflicts, routing issues, and network misconfiguration. This tool ensures accuracy when planning network segmentation or troubleshooting connectivity problems.

Perfect for network engineers designing network topologies, system administrators configuring routers and switches, DevOps engineers setting up cloud VPCs, and IT students learning subnetting concepts with instant visual feedback.

Network Design: Plan subnet allocation for departments, VLANs, or network segments with optimal address space utilization and proper network boundaries.

Cloud Infrastructure: Configure VPC subnets, security groups, and routing tables in AWS, Azure, or GCP with accurate CIDR calculations and host counts.

Troubleshooting: Verify network configurations, diagnose routing issues, and validate subnet masks when investigating connectivity problems or IP conflicts.

Enter an IPv4 address and specify the subnet using either CIDR notation (e.g., /24) or subnet mask (e.g., 255.255.255.0). The tool accepts various formats and validates the input automatically.

View comprehensive subnet information including network address, broadcast address, first and last usable host IPs, total hosts, subnet mask in all formats, wildcard mask, network class, and binary representations for educational purposes.