It can be anything! An apex, subdomain, or even a URL.
Results forext.azure.com.office.o365.phoenixprod.myshn.eu
www.ext.azure.com.office.o365.phoenixprod.myshn.euazure.com.office.o365.phoenixprod.myshn.eucom.office.o365.phoenixprod.myshn.euoffice.o365.phoenixprod.myshn.euo365.phoenixprod.myshn.euphoenixprod.myshn.eumyshn.eueu