问题
Is there a limit to the number of Public IPs you can use for a given AWS region? (Not Elastic IPs)
Note - I know that you are limited to 5 Elastic IPs. However, if you choose "auto assign IP" when creating and AWS instance, you are given an IP which changes on restart. My question is what the limit is on these "Public IPs" that change every time your instance is stopped and started?
回答1:
There is no limit on Public IPs that you can use in AWS. Limit is only on number of instances that you can launch and that instance limit too can be increased by contacting the AWS Support.
回答2:
It is limited by the number of instance limit in your account and region. By default you have a limit of 20 instances/region. You can choose to launch all instances in public subnet with auto-assign-public-ip and use 20 public IPs.
For example, you requested an instance limit increase of 200 with justification and if it was approved, you can use up to 200 public IPs / region.
To view your limit: Viewing Your Current Limits
来源：https://stackoverflow.com/questions/39130595/what-is-the-aws-public-ip-limit-public-ip-not-elastic-ip