It can be anything! An apex, subdomain, or even a URL.
Results forofficeredir.microsoft.com.office.m365---mcafeecloud.mcafee.myshn.eu
www.officeredir.microsoft.com.office.m365---mcafeecloud.mcafee.myshn.eumicrosoft.com.office.m365---mcafeecloud.mcafee.myshn.eucom.office.m365---mcafeecloud.mcafee.myshn.euoffice.m365---mcafeecloud.mcafee.myshn.eum365---mcafeecloud.mcafee.myshn.eumcafee.myshn.eumyshn.eueu