ht.aol.com is a domain controlled by two nameservers at ns.aol.com. They are on different IP networks. aol.nl, aol.fr, aim.com, aol.com, aol.net and at least 56 other hosts share nameservers with this domain. ht-d23.ht.aol.com, ht-d27.ht.aol.com, ht-d77.ht.aol.com, ht-d30.ht.aol.com, ht-d36.ht.aol.com and at least 26 other hosts are subdomains to this hostname. aol.com is a domain controlled by four nameservers also at ns.aol.com. All of them are on different IP networks. Incoming mail for aol.com is handled by four mailservers having a total of 30 IP numbers. Some of them are on the same IP network. aol.com has four IP numbers. Two of them are on the same IP network.