phx1.secureserver.net

Summary

mgmt.phx1.secureserver.net and prod.phx1.secureserver.net are subdomains to this hostname. secureserver.net is a domain controlled by two nameservers at secureserver.net themselves. They are on different IP networks. Incoming mail for secureserver.net is handled by one mailserver also at secureserver.net. secureserver.net has one IP number.