Is the VPC CIDR Calculator private?

Yes. This tool runs in your browser and does not upload your input to ToolHive.

Do I need an account?

No. You can use it directly without login.

Yes. Click the star icon to save it in this browser.

Calculate subnet prefix, count, and AWS usable IPv4 addresses.

A VPC CIDR calculator for subnet planning, AWS usable IP estimation, and VPC network design.

AWS tools parse and estimate locally by default. Cost results are rough planning estimates; verify with AWS Pricing Calculator and billing data.

VPC CIDR

Additional subnet bits

Network: 10.0.0.0
Broadcast: 10.0.255.255
Parent prefix: /16
Subnet prefix: /24
Subnet count: 256
AWS usable IPv4 / subnet: 251

This tool runs locally in your browser. Your input is not uploaded to ToolHive.

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