It can be anything! An apex, subdomain, or even a URL.
Results foractivedirectory.windowsazure.com.office.test.proxyqa.myshn.eu
www.activedirectory.windowsazure.com.office.test.proxyqa.myshn.euwindowsazure.com.office.test.proxyqa.myshn.eucom.office.test.proxyqa.myshn.euoffice.test.proxyqa.myshn.eutest.proxyqa.myshn.euproxyqa.myshn.eumyshn.eueu