Elastic IPs

An Elastic IP (EIP) is an IP address that you can reserve from AWS for your account. Once you've created an Elastic IP, you can assign it to any instance of your choice. Once you reserve an Elastic IP, nobody else can use that IP address. Elastic IPs are dynamically remappable IP addresses that make it easier to manage servers and make global changes compared to static IPs on traditional hosting solutions, because each EIP can be reassigned to a different instance when needed. You can assign an EIP to a running instance or associate an EIP when an instance is launched. Be careful, you can also "steal" an EIP from one of your instances.  See Elastic IP (EIP) for more information.

This screen will display the IP address of each EIP as well as its availability.