It can be anything! An apex, subdomain, or even a URL.
Results forsharepoint.microsoftonline.com.office.default.bt.myshn.eu
www.sharepoint.microsoftonline.com.office.default.bt.myshn.eumicrosoftonline.com.office.default.bt.myshn.eucom.office.default.bt.myshn.euoffice.default.bt.myshn.eudefault.bt.myshn.eubt.myshn.eumyshn.eueu