Amazon VPC Concepts
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External
Internal
Overview
Amazon VPC provides a logically isolated section of the AWS Cloud where AWS resources run in a private virtual network.
Subnet
Route Table
Network Gateway
Security
Security Group
Network Access Control List (ACL)
Subnet
A subnet is a range of IP addresses in the Virtual Private Cloud (VPC) that can be used to isolate different EC2 resources or ECS services from each other or from the Internet. Each subnet resides in one Availability Zone. Subnets enable you to group instances based on security and operational needs. To enable instances in a subnet to reach the Internet and AWS services, you must add an Internet gateway to the VPC and a route table with a route to the Internet to the subnet.
Example:
subnet-53993c24: 172.31.16.0/20