It can be anything! An apex, subdomain, or even a URL.
Results foractivedirectory.windowsazure.com.office.uxtenant.mcafee.myshn.eu
www.activedirectory.windowsazure.com.office.uxtenant.mcafee.myshn.euwindowsazure.com.office.uxtenant.mcafee.myshn.eucom.office.uxtenant.mcafee.myshn.euoffice.uxtenant.mcafee.myshn.euuxtenant.mcafee.myshn.eumcafee.myshn.eumyshn.eueu