It can be anything! An apex, subdomain, or even a URL.
www.s3ep.private.us-south.gslb.cloud-object-storage.appdomain.cloudprivate.us-south.gslb.cloud-object-storage.appdomain.cloudus-south.gslb.cloud-object-storage.appdomain.cloudgslb.cloud-object-storage.appdomain.cloudcloud-object-storage.appdomain.cloudappdomain.cloudcloud