It can be anything! An apex, subdomain, or even a URL.

Results forcrt.rootg2.amazontrust.com

Resolver

Location

A

Name	TTL	Value
crt.rootg2.amazontrust.com	60	3.167.69.10AWS CloudFront (GLOBAL) / Amazon.com, Inc.
crt.rootg2.amazontrust.com	60	3.167.69.74AWS CloudFront (GLOBAL) / Amazon.com, Inc.
crt.rootg2.amazontrust.com	60	3.167.69.79AWS CloudFront (GLOBAL) / Amazon.com, Inc.
crt.rootg2.amazontrust.com	60	3.167.69.110AWS CloudFront (GLOBAL) / Amazon.com, Inc.