It can be anything! An apex, subdomain, or even a URL.
Results forwww.ad.ext.azure.com.lab1.office.supporttrainingeu.myshn.eu
ad.ext.azure.com.lab1.office.supporttrainingeu.myshn.euext.azure.com.lab1.office.supporttrainingeu.myshn.euazure.com.lab1.office.supporttrainingeu.myshn.eucom.lab1.office.supporttrainingeu.myshn.eulab1.office.supporttrainingeu.myshn.euoffice.supporttrainingeu.myshn.eusupporttrainingeu.myshn.eumyshn.eueu