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

Results forcrt.sca1b.amazontrust.com

Resolver

Location

A

Name	TTL	Value
crt.sca1b.amazontrust.com	60	18.160.45.3AWS CloudFront (GLOBAL) / Amazon.com, Inc.
crt.sca1b.amazontrust.com	60	18.160.45.21AWS CloudFront (GLOBAL) / Amazon.com, Inc.
crt.sca1b.amazontrust.com	60	18.160.45.30AWS CloudFront (GLOBAL) / Amazon.com, Inc.
crt.sca1b.amazontrust.com	60	18.160.45.139AWS CloudFront (GLOBAL) / Amazon.com, Inc.