Static IP addresses designed for dynamic cloud computing.
Associated with your account.
Need to explicitly release it
It can be remapped programmatically.
5 Elastic IP addresses are offered by AWS.
1:1 mapping for Elastic IP and instance.
A reboot or restart of an instance has no impact on the mapping of an Elastic IP to it.
Instance termination will remove the mapping and the Elastic IP.
$.01/hr charge when these IP addresses are not mapped to an instance.
EC2 Private IP Address: only routable within the EC2 Cloud. Network traffic originating outside the EC2 network cannot route to this IP.
EC2 Public IP Address: Internet routable IP address assigned by the system for all instances. Traffic routed to the Public IP is translated via 1:1 Network Address Translation (NAT) and forwarded to the Private IP address of an instance.
EC2 Elastic IP Address: Internet routable IP address allocated to an AWS EC2 account. It can be remapped to other instances when desired.