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

Results forgo.pp.mrd.com

Resolver

Location

A

Name	TTL	Value
go.pp.mrd.com	60	108.138.85.3AWS CloudFront (GLOBAL) / Amazon.com, Inc.
go.pp.mrd.com	60	108.138.85.4AWS CloudFront (GLOBAL) / Amazon.com, Inc.
go.pp.mrd.com	60	108.138.85.38AWS CloudFront (GLOBAL) / Amazon.com, Inc.
go.pp.mrd.com	60	108.138.85.109AWS CloudFront (GLOBAL) / Amazon.com, Inc.