It can be anything! An apex, subdomain, or even a URL.
Results foredge.skype.com.office.default.proxyaws.myshn.eu
www.edge.skype.com.office.default.proxyaws.myshn.euskype.com.office.default.proxyaws.myshn.eucom.office.default.proxyaws.myshn.euoffice.default.proxyaws.myshn.eudefault.proxyaws.myshn.euproxyaws.myshn.eumyshn.eueu