cfn-lint
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CIDR Validation
CidrBlock
, CidrIp
and DestinationCidrBlock
values should be validated for a valid Cidr string format.
As an example, this typo "CidrIp": "38.121.87.72/33",
will generate a error during the deployment, and could be catched by cfn-lint.
Could use this tool: https://www.npmjs.com/package/cidr-regex