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Cloud Computing · Foundational

Elastic IP Address (EIP)

Static public IPv4 address allocated to an AWS account that can be remapped between instances or network interfaces.

Definition

An Elastic IP address persists until released and can be quickly moved to another instance to mask failures. AWS charges for all public IPv4 addresses, including Elastic IPs, whether attached or idle, so unused EIPs should be released.

Example

After an instance fails, a script reassociates its Elastic IP to a standby instance.

Exam tip

Prefer load balancers or DNS over Elastic IPs for availability; remember that public IPv4 addresses incur hourly charges.

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