It can be anything! An apex, subdomain, or even a URL.
Results forres.communication.github.com.cname.campaign.adobe.com
www.res.communication.github.com.cname.campaign.adobe.comcommunication.github.com.cname.campaign.adobe.comgithub.com.cname.campaign.adobe.comcom.cname.campaign.adobe.comcname.campaign.adobe.comcampaign.adobe.comadobe.comcom