60.12.193.in-addr.arpa is a domain controlled by two nameservers at dns.swip.net. They are on different IP networks. hh.se, lu.se, mil.se, lfv.se, ptj.se and at least 100 other hosts share nameservers with this domain. 12.193.in-addr.arpa is a domain controlled by four nameservers. All of them are on different IP networks.