Default VPC Overview
A default VPC is suitable for getting started quickly, and for launching public instances such as a blog or simple website.
If you want to have a more specific VPC tailored to your requirements, it is recommended to use a Custom VPC (nondefault VPC).
You can only have 1 default VPC per region.
Each VPC subnet is in a different Availability Zone and together, they span across all the Availability Zones in the region.
The CIDR Range is always the same (172.31.0.0/16).
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