It can be anything! An apex, subdomain, or even a URL.
Results forwww.ww25.hostmaster.hostmaster.hostmaster.mta-sts.mx7.myuhsinc.com
ww25.hostmaster.hostmaster.hostmaster.mta-sts.mx7.myuhsinc.comhostmaster.hostmaster.hostmaster.mta-sts.mx7.myuhsinc.comhostmaster.hostmaster.mta-sts.mx7.myuhsinc.comhostmaster.mta-sts.mx7.myuhsinc.commta-sts.mx7.myuhsinc.commx7.myuhsinc.commyuhsinc.comcom