Amazon EC2 Maximum Number of Instances Limit

Default Limits in Amazon Web Services (AWS) (Instances, EBS volumes and IP addresses)

Instances: 20 http://aws.amazon.com/contact-us/ec2-request/
Elastic IP Addresses: 5 http://aws.amazon.com/contact-us/eip_limit_request/
EBS Volumes: 20 http://aws.amazon.com/contact-us/ebs_volume_limit_request/
EBS Snapshots: 500 aws@amazon.com