AWS Subnet Calculator

Plan, visualize, and export your AWS VPC subnets with our advanced calculator

Powerful Features for AWS Network Planning

Plan your VPC subnets across multiple availability zones with custom CIDR blocks

Visualize your subnet allocation and network topology with interactive diagrams

Generate Terraform and CloudFormation code for your subnet configuration

Export your subnet plan as JSON, CSV, or infrastructure code

Plan and visualize your AWS VPC subnets with advanced features

VPC Configuration

Define your VPC CIDR block and region settings

VPC CIDR Block

AWS Region

Availability Zones

Account for AWS reserved IPs (first 5 and last 1)

Subnet Configuration

Define your subnet tiers and their properties

Subnet Name

CIDR Mask

Subnets Per AZ

Subnet Name

CIDR Mask

Subnets Per AZ

Network Components

Configure additional network components for your VPC

Create Internet Gateway

Required for public subnets to access the internet

Create NAT Gateway

Allows private subnets to access the internet (requires both public and private subnets)

NAT Gateway per AZ

Creates a NAT Gateway in each AZ for high availability

Include Elastic IPs

Allocate Elastic IPs for NAT Gateways

Include S3 VPC Endpoint

Adds a gateway endpoint for Amazon S3

Include DynamoDB VPC Endpoint

Adds a gateway endpoint for Amazon DynamoDB

Use our AWS Subnet Calculator to plan your infrastructure efficiently