It can be anything! An apex, subdomain, or even a URL.
Results forwww.edge.skype.com.office.testo36.qauniversaltenant1.myshn.eu
edge.skype.com.office.testo36.qauniversaltenant1.myshn.euskype.com.office.testo36.qauniversaltenant1.myshn.eucom.office.testo36.qauniversaltenant1.myshn.euoffice.testo36.qauniversaltenant1.myshn.eutesto36.qauniversaltenant1.myshn.euqauniversaltenant1.myshn.eumyshn.eueu