Variable Length Subnet Masking (VLSM) Planner

Subnetting Practice Lab & Auto-Calculator

1. Parent Block Settings

2. Required Subnets Up to 10 subnets

3. Subnet Layout Worksheet

Subnet the parent IP block based on host requirements. Enter your calculations below. Once your math is fully verified, the Cisco IOS CLI commands will automatically unlock!

VLAN / Subnet Subnet Mask CIDR Network ID Default Gateway 1st Usable Host Last Usable Host Broadcast IP
IP Allocation: 0 / 256 IPs (0% Allocated) 254 usable IP addresses remaining.

4. IP Space Allocation Map

Allocated Subnet
Unallocated Free Space

5. Cisco IOS CLI Configurations

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Cisco CLI commands are currently locked.

To unlock the Cisco IOS scripts, switch to **Auto-Calculator** mode or complete the **Worksheet Practice** with 100% correct calculations.