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The auto-assigned public IP address associated with EC2 instance changes every time you stop and start the instance.
An Elastic IP address is a static public IPv4 address associated with your AWS account in a specific Region. Unlike an auto-assigned public IP address, an Elastic IP address is preserved after you stop and start your instance in a virtual private cloud (VPC).
https://aws.amazon.com/premiumsupport/knowledge-center/ec2-recover-ip-address/
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