It can be anything! An apex, subdomain, or even a URL.
Results forofficeredir.microsoft.com.office.eumso-3.euprod201.myshn.eu
www.officeredir.microsoft.com.office.eumso-3.euprod201.myshn.eumicrosoft.com.office.eumso-3.euprod201.myshn.eucom.office.eumso-3.euprod201.myshn.euoffice.eumso-3.euprod201.myshn.eueumso-3.euprod201.myshn.eueuprod201.myshn.eumyshn.eueu