16.177.81.in-addr.arpa is delegated to two nameservers, however one extra nameserver is listed in the zone. All nameservers are at majordomo.ru. All of them are on different IP networks. f1.ru, uvb.ru, asn.ru, l27.ru, noo.ru and at least 37 other hosts share nameservers with this domain. 177.81.in-addr.arpa is a domain controlled by five nameservers. Some of them are on the same IP network.