176.186.212.in-addr.arpa is a domain controlled by two nameservers at chello.com. They are on different IP networks. upc.nl, upc.ie, tvd.be, chello.be, film1.biz and at least 56 other hosts share nameservers with this domain. 186.212.in-addr.arpa is delegated to three nameservers, however all three delegated nameservers are missing in the zone. All of them are on different IP networks.