HEY ARNOLD: A GUIDE TO ALL THE AMAZON RESOURCE IDENTIFIER FORMATS IN AWS

Summary from the TLDR InfoSec newsletter

Fog Security conducted a comprehensive investigation to identify all the various AWS ARN formats and discovered nearly 2,000 different ARNs supported by AWS IAM. While most ARNs follow a standard format of `arn:partition:service:region:account-id:resource-id`, some omit the account-id, some require a namespace, and there are other inconsistencies and duplication. Fog released a searchable listing of all ARNs as well as JSONs of all ARN formats and all service prefixes.