Subnet Calculator
Calculate network details including subnet mask, network address, broadcast address, and assignable host ranges from an IP address and CIDR block.
Understanding Subnet Calculations
A subnet calculator is a critical networking tool for network administrators, IT professionals, and developers. It simplifies the process of breaking down a single IP address and its associated CIDR (Classless Inter-Domain Routing) mask into smaller, more manageable sub-networks (or "subnets").
By computing the Network Address and Broadcast Address, this tool enables you to accurately determine the exact range of usable IP addresses available for your devices, servers, and routers. Proper subnetting improves network performance by isolating traffic, reducing broadcast domains, and increasing overall security.
This IPv4 Subnet Calculator works purely in your browser, instantly processing your IP address (e.g., 192.168.1.1) and CIDR notation (e.g., /24) to translate binary IP math into human-readable limits. Whether you are configuring AWS VPCs, setting up corporate LANs, or studying for certifications like CCNA, this tool provides real-time, accurate results including standard IP classifications (Class A, B, C).