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

Results forcdn.challenges.trion.app

Resolver

Location

A

Name	TTL	Value
cdn.challenges.trion.app	60	52.85.132.61AWS CloudFront (GLOBAL) / Amazon.com, Inc.
cdn.challenges.trion.app	60	52.85.132.82AWS CloudFront (GLOBAL) / Amazon.com, Inc.
cdn.challenges.trion.app	60	52.85.132.92AWS CloudFront (GLOBAL) / Amazon.com, Inc.
cdn.challenges.trion.app	60	52.85.132.111AWS CloudFront (GLOBAL) / Amazon.com, Inc.