100.9.200.in-addr.arpa is delegated to two nameservers, however both delegated nameservers are missing in the zone and two other nameservers are listed instead. Two nameservers have the same IP number. Two of them are on the same IP network. sw.cl, cmt.cl, jcc.cl, sqm.cl, syn.cl and at least 67 other hosts share nameservers with this domain.