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AWS::EC2::Subnet

  • Usually a VPC contains 3 subnets by default. One for each AZ
  • The subnet is associated with a VPC and has a CIDR within the range of the CIDR of the VPC
  • A subnet is tied to an AZ

  • AWS reserves the first 4 and last 1 IPs in each subnet

  • Private Subnets usually have a wider range, usually smaller than /20

  • Public Subnets do not need wide range, usually /24

  • Subnets can have auto-assign Public IP to automatically request a public IP for each service within that subnet

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