Summary
89.22.212.in-addr.arpa is delegated to six nameservers, however one delegated nameserver is missing in the zone and one other nameserver is listed instead. Two nameservers have the same IP number. Two of them are on the same IP network.
pp.ru,
sc.ru,
ru.net,
msk.ru,
kmn.ru and at least 79 other hosts share nameservers with this domain.