It can be anything! An apex, subdomain, or even a URL.
Results forwww.activedirectory.windowsazure.com.office.testdeployment.proxyautomation.myshn.eu
activedirectory.windowsazure.com.office.testdeployment.proxyautomation.myshn.euwindowsazure.com.office.testdeployment.proxyautomation.myshn.eucom.office.testdeployment.proxyautomation.myshn.euoffice.testdeployment.proxyautomation.myshn.eutestdeployment.proxyautomation.myshn.euproxyautomation.myshn.eumyshn.eueu