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Subnet & CIDR Planner

Split IPv4 networks into subnets, calculate cloud usable addresses and check overlapping CIDR ranges.

About this tool

Split IPv4 networks into subnets, calculate cloud usable addresses and check overlapping CIDR ranges.

How to use Subnet & CIDR Planner

  1. Choose a provider or scheduler and enter your inputs.
  2. Generate or validate, review the result and download an export.

Example

Split 10.0.0.0/16 into four /24 subnets.

Supported options and limitations

IPv4 only; Azure/AWS reserve five addresses, GCP primary ranges reserve four. Service-specific minimums apply.

Common questions

Are my inputs uploaded?

No. Processing runs in your browser without a cloud account.