Subnet Calc

Subnet Calc is a fast, clean, and modern IPv4/IPv6 address calculator and visual IP planner designed for network engineers, cloud architects, sysadmins, and DevOps professionals.

Built to replace outdated, ad-laden web calculators and fragile spreadsheets, Subnet Calc combines instant CIDR arithmetic with visual network mapping and collaborative project management.

Key Features & Capabilities ⚡ Instant IPv4 & IPv6 Calculations: Type any CIDR notation to instantly calculate network addresses, broadcast IDs, usable host ranges, wildcard masks, subnet masks, and total IP capacity.

📐 Visual Subnet Splitting: Easily split parent networks into smaller child subnets visually. See address allocation and remaining unallocated space in real-time without doing manual binary math.

🏷️ Project & System Mapping: Promote subnet nodes directly into active environments, projects, or infrastructure components. Tag and track address space assigned to specific VPCs, VNets, offices, or microservices.

🔄 Team Sync & Version Control: Organize IP allocations into versioned projects. Save state, collaborate with team members, and keep an auditable record of network changes over time.

While traditional tools only calculate basic network math, Subnet Calc bridges the gap between a quick IP utility and a lightweight IP Address Management (IPAM) solution. Whether you need a 5-second subnet breakdown or a structured way to plan multi-region cloud VPCs as a team, Subnet Calc provides a modern, fast, and ad-free workspace.