197.177.83.in-addr.arpa is a domain controlled by two nameservers at dns.swip.net. They are on different IP networks. mm.se, hh.se, lu.se, mil.se, jgv.se and at least 100 other hosts share nameservers with this domain. 177.83.in-addr.arpa is a domain controlled by four nameservers. All of them are on different IP networks.