VLAN Planner
Plan VLAN subnets with VLSM allocation. Add departments with host counts and get optimized IP ranges.
Root Network
Departments
Allocation Table
| Department | VLAN | Needed | Usable | Network | Range | Broadcast | Mask |
|---|---|---|---|---|---|---|---|
| Engineering | 10 | 120 | 126 | 10.0.0.0 | 10.0.0.1 — 10.0.0.126 | 10.0.0.127 | /25 |
| Guest WiFi | 30 | 50 | 62 | 10.0.0.128 | 10.0.0.129 — 10.0.0.190 | 10.0.0.191 | /26 |
| HR | 20 | 25 | 30 | 10.0.0.192 | 10.0.0.193 — 10.0.0.222 | 10.0.0.223 | /27 |
How It Works
The VLAN Planner uses VLSM (Variable Length Subnet Mask) to efficiently allocate IP blocks. It sorts departments by size (largest first) and assigns the smallest power-of-2 block that fits each department's host count plus network/broadcast overhead.
VLSM Algorithm
Last Updated: February 2026. IPv4 only.
About the VLAN Planner
This vlan planner helps with subnetting, bandwidth, DNS TTL, and other IT networking calculations. Plan VLAN subnets with VLSM allocation for departments and segments.
Use for network planning, certification prep, and sysadmin troubleshooting.
Adjust the inputs above to model your specific scenario with the VLAN Planner.
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