Overview – Elastic IP in AWS (Amazon Public Cloud) in One Minute

  • 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.

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