21.174.193.in-addr.arpa is a domain controlled by three nameservers. Two of them are on the same IP network. bsh.de, edu.cn, eqa.de, dbp.de, aip.de and at least 45 other hosts share nameservers with this domain. 174.193.in-addr.arpa is a domain controlled by five nameservers having a total of six IP numbers. Some of them are on the same IP network.