The resource ID of Route 53 Domain resources is constructed like the below:
[AccountId]::AWS.Route53Domains/[domain]
Example:
123456789012::AWS.Route53Domains/example.com
This construction allows you to do the following:
Differentiate between Route 53 Domain resources across all AWS accounts you have linked, by checking the characters before the first colon.
Differentiate between Domain resources within an account, by checking the characters after the /.
Background
Amazon Route 53 is a highly available and scalable DNS (Domain Name Service) web service. Route 53 connects user requests to internet applications running on AWS or on-premises.