VLSM Calculator
Variable Length Subnet Masking. Give it a base network and your host requirements per subnet, it allocates the most efficient blocks automatically, largest first, zero waste.
// Subnet Requirements
Name / VLAN
Hosts needed
Address space usage
Allocated Subnets
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| Subnet name | Network / Prefix | Subnet mask | Host range | Hosts avail. | Requested |
|---|
// how VLSM works
VLSM allocates subnets by sorting requirements largest first, then assigning the smallest possible prefix that fits. This avoids wasting large blocks on small requirements.