193.0.66.in-addr.arpa is a domain controlled by three nameservers at deltacom.net. All of them are on different IP networks. bti.com, acc.edu, mahl.com, acc1.edu, msar.org and at least 77 other hosts share nameservers with this domain. 0.66.in-addr.arpa is delegated to two nameservers, however one extra nameserver is listed in the zone. All nameservers are also at deltacom.net. All of them are on different IP networks.