You can now register Amazon EC2 instances in AWS Cloud Map by providing EC2 instance identifiers instead of the IP address when using HTTP namespaces. AWS Cloud Map is a cloud resource discovery service. Using AWS Cloud Map, you can define custom names for your application resources, such as Amazon EC2 instances, Amazon ECS tasks, Amazon S3 buckets, or any other cloud resource. Your application can then discover the location and metadata of cloud resources associated with these custom names via AWS SDK or by making authenticated API calls.
Source:: Amazon AWS