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>ec2 server reboots, its ip address is set by the provider of that connection, this means it may update at any time

From memory, EC2 instances only get provisioned a new IP when booted from cold, not a reboot.

Also, AWS lets you ask for a static IP access (EIP) which you don't pay for so long as it is attached to something (an ec2 instance, a load balancer, etc).

An EC2 switched off can still have an EIP attached and that attachment is billed I think.

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