A. Use AWS CloudFormation to deploy the VPC infrastructure and a custom resource to request a CIDR range from an external IP address management (IPAM) service. Most Voted
B. Use AWS OpsWorks to deploy the VPC infrastructure and a custom resource to request a CIDR range from an external IP address management (IPAM) service.
C. Use the VPC wizard in the AWS Management Console. Type in the CIDR blocks for the VPC and subnets.
D. Create the VPCs using AWS CLI and use the dry-run flag to validate if the current CIDR range is in use.

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