AWS IP Address Planning Tools
A well thought out IP Address Plan is designed with both
subnetting
A single large network divided into multiple smaller subnetworks.
Top-down view.
and
supernetting
Multiple smaller subnetworks combined into a single large network.
Bottom-up view.
in mind.
Subnetting and supernetting are opposites and can sometimes be difficult to combine.
Below I've added a couple of tools created to help you design the best IP Address plan for your needs, giving you the opportunity to mix, match and adjust the values as you go along, always seeing the consequences of your choices.
These tools are perfect for multi-account, multi-region architectures where you need full, transitive, interconnectivity between VPCs and accounts.
CIDR Block Calculator
Create and manage hierarchical IP address plans with an interactive interface.
Open CalculatorCIDR Block Estimator
Calculate the optimal top-level CIDR block size based on your infrastructure requirements. Helps prevent IP address space wastage.
Open Estimator