When you create your AWS account, AWS sets limits to the resources available to you. The limits can vary by region.
The EC2 Service Limits page lists the limits for the resources available to you in your EC2 instance, including limits to the number of instances and hosts.
The Networking Limits section on the page lists the VPC, subnet, and security group limits for your AWS account. For example, there is typically a limit of 5 VPCs per region.
If you require more resources than the limit set by Amazon, you can request Amazon to raise the limit of a resource. On the EC2 Service Limits page, click Request limit increase for the resource that you want to increase and create an AWS support case for a Service Limit Increase.For more information about AWS limits, refer to AWS Service Limits in AWS documentation.