It can be anything! An apex, subdomain, or even a URL.
Results for*.res.outlook.com.office.lucleiasc---reverse.mcafee.myshn.eu
www.*.res.outlook.com.office.lucleiasc---reverse.mcafee.myshn.eures.outlook.com.office.lucleiasc---reverse.mcafee.myshn.euoutlook.com.office.lucleiasc---reverse.mcafee.myshn.eucom.office.lucleiasc---reverse.mcafee.myshn.euoffice.lucleiasc---reverse.mcafee.myshn.eulucleiasc---reverse.mcafee.myshn.eumcafee.myshn.eumyshn.eueu