Amazon EC2 now supports Availability Zone ID across its APIs

Amazon EC2 now supports Availability Zone ID (AZ ID) parameter, enabling you to create and manage resources such as instances, volumes, and subnets using consistent zone identifiers. AZ IDs are consistent and static identifiers that represent the same physical location across all AWS accounts, helping you optimize resource placement.

Prior to this launch, you had to use an AZ name while creating a resource, but these names could map to different physical locations. This mapping made it difficult to ensure resources were always co-located especially when operating with multiple accounts. Now, you can specify the AZ ID parameter directly in your EC2 APIs to guarantee consistent placement of resources. AZ IDs always refer to the same physical location across all accounts, which means you no longer need to manually map AZ names across your accounts or deal with the complexity of tracking and aligning zones. This capability is now available for resources including instances, launch templates, hosts, reserved instances, fleet, spot instances, volumes, capacity reservations, network insights, VPC endpoints and subnets, network interfaces, fast snapshot restore, and instance connect.

This feature is available in all AWS regions including China and AWS GovCloud (US) Regions. To learn more about Availability Zone IDs, visit the documentation.