Variable Length Subnet Masking (VLSM) allows you to create subnets of different sizes within a single network, optimizing IP address utilization and reducing waste by up to 80%.
Automatically calculates the smallest subnet mask that fits your requirements
Minimize IP address waste by creating right-sized subnets
Intelligent algorithm allocates largest subnets first
Variable Length Subnet Masking (VLSM) allows you to create subnets of different sizes within a single network, optimizing IP address utilization and reducing waste.
All subnets are the same size, leading to significant IP address waste when subnet requirements vary.
Example: Using /26 for both 50 hosts and 5 hosts wastes 57 addresses
Each subnet gets exactly the right size, maximizing efficiency and minimizing waste.
Example: /26 for 50 hosts, /29 for 5 hosts - optimal utilization
Our VLSM calculator uses the industry-standard approach: sort subnet requirements by size (largest first), then allocate each subnet using the smallest possible subnet mask. This ensures optimal address space utilization and prevents fragmentation issues.