It can be anything! An apex, subdomain, or even a URL.
Results forwww.outlook.com.rantec1.o365---lab.ransecurityshn2.myshn.net
outlook.com.rantec1.o365---lab.ransecurityshn2.myshn.netcom.rantec1.o365---lab.ransecurityshn2.myshn.netrantec1.o365---lab.ransecurityshn2.myshn.neto365---lab.ransecurityshn2.myshn.netransecurityshn2.myshn.netmyshn.netnet