gistfile1.txt

$ aws ec2 describe-account-attributes --attribute-names supported-platforms
{
    "AccountAttributes": [
        {
            "AttributeName": "supported-platforms", 
            "AttributeValues": [
                {
                    "AttributeValue": "EC2"
                }, 
                {
                    "AttributeValue": "VPC"
                }
            ]
        }
    ]
}
$ aws ec2 create-default-vpc

An error occurred (OperationNotPermitted) when calling the CreateDefaultVpc operation: Accounts on the EC2-Classic platform cannot create a default VPC.