By default Amazon has service limits on each AWS a/c both in EC2 as well as VPC. For e.g., we have to open a service limit ticket to increase the number of available elastic ip addresses (EIP) to a number higher than 5 per region. Similarly for no. of ec2 instances that can be provisioned by default is 20. You can look at the tables for service limits on AWS website: - aws service limits
Nice blog post on AWS
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