AWS CloudFormation
User Guide (API Version 2010-05-15)
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The intrinsic function Fn::GetAZs returns an array that lists all Availability Zones for the specified region.

Because customers have access to different Availability Zones, the intrinsic function Fn::GetAZs enables template authors to write templates that adapt to the calling user's access. This frees you from having to hard-code a full list of Availability Zones for a specified region.


"Fn::GetAZs" : "region"



The name of the region for which you want to get the Availability Zones.

You can use the AWS::Region pseudo parameter to specify the region in which the stack is created. Specifying an empty string is equivalent to specifying AWS::Region.

Return Value

The list of Availability Zones for the region.


{ "Fn::GetAZs" : "" }
{ "Fn::GetAZs" : { "Ref" : "AWS::Region" } }
{ "Fn::GetAZs" : "us-east-1" }

For both of the previous examples, AWS CloudFormation evaluates Fn::GetAZs to the following array—assuming that the user has created the stack in the us-east-1 region:

[ "us-east-1a", "us-east-1b", "us-east-1c" ]