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In order to create RDS, I need to create a VPC and two subnets attached to it.

If I choose 10.0.0.0/16 as IPv4 CIDR for VPC, can you please suggest IPv4 CIDR blocks for the two subnets that I have to create?

Thanks

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You should split that up in to subnets with /24, like this:

10.0.1.0/24
10.0.2.0/24

Any /24 in the 10.0.0.0 to 10.0.255.0 range is valid. I suggest reading the VPC and Subnet Basics in the AWS docs also.

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