Cost optimization - AWS Support
Unassociated Elastic IP Addresses
This documentation is a draft for private preview for regions in the AWS European Sovereign Cloud. Documentation content will continue to evolve. Published: December 30, 2025.

Cost optimization

You can use the following checks for the cost optimization category.

Unassociated Elastic IP Addresses

Description

Checks for Elastic IP addresses (EIPs) that are not associated with a running Amazon Elastic Compute Cloud (Amazon EC2) instance.

EIPs are static IP addresses designed for dynamic cloud computing. Unlike traditional static IP addresses, EIPs mask the failure of an instance or Availability Zone by remapping a public IP address to another instance in your account. A nominal charge is imposed for an EIP that is not associated with a running instance.

Note

This check reports the resources that are flagged by the criteria and the total number of resources evaluated, including OK resources. The resources table lists only the flagged resources.

Check ID

Z4AUBRNSmz

Alert Criteria

Yellow: An allocated Elastic IP address (EIP) is not associated with a running Amazon EC2 instance.

Recommended Action

Associate the EIP with a running active instance, or release the unassociated EIP. For more information, see Associating an Elastic IP Address with a Different Running Instance and Releasing an Elastic IP Address.

Additional Resources

Elastic IP Addresses

Report columns

  • Region

  • IP Address