If you click on running instance, you will also what Elastic IP address is associated with it.

How to allocate Elastic IP address to Amazon EC2 Instances - 49How to allocate Elastic IP address to Amazon EC2 Instances - 46How to allocate Elastic IP address to Amazon EC2 Instances - 9How to allocate Elastic IP address to Amazon EC2 Instances - 8How to allocate Elastic IP address to Amazon EC2 Instances - 85How to allocate Elastic IP address to Amazon EC2 Instances - 3How to allocate Elastic IP address to Amazon EC2 Instances - 47How to allocate Elastic IP address to Amazon EC2 Instances - 20