It can be anything! An apex, subdomain, or even a URL.
Results forwww.inc-word-view.officeapps.live.com.office.default.bt.myshn.eu
inc-word-view.officeapps.live.com.office.default.bt.myshn.euofficeapps.live.com.office.default.bt.myshn.eulive.com.office.default.bt.myshn.eucom.office.default.bt.myshn.euoffice.default.bt.myshn.eudefault.bt.myshn.eubt.myshn.eumyshn.eueu