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

Results forem.test.tryforest.com

Resolver

Location

A

Name	TTL	Value
em.test.tryforest.com	60	3.171.61.5AWS CloudFront (GLOBAL) / Amazon.com, Inc.
em.test.tryforest.com	60	3.171.61.11AWS CloudFront (GLOBAL) / Amazon.com, Inc.
em.test.tryforest.com	60	3.171.61.73AWS CloudFront (GLOBAL) / Amazon.com, Inc.
em.test.tryforest.com	60	3.171.61.129AWS CloudFront (GLOBAL) / Amazon.com, Inc.