It can be anything! An apex, subdomain, or even a URL.
Results foraadcdn.microsoftonline-p.com.office.eucouncilo365proxy.eucouncileupoc.myshn.eu
www.aadcdn.microsoftonline-p.com.office.eucouncilo365proxy.eucouncileupoc.myshn.eumicrosoftonline-p.com.office.eucouncilo365proxy.eucouncileupoc.myshn.eucom.office.eucouncilo365proxy.eucouncileupoc.myshn.euoffice.eucouncilo365proxy.eucouncileupoc.myshn.eueucouncilo365proxy.eucouncileupoc.myshn.eueucouncileupoc.myshn.eumyshn.eueu