157.57.194.in-addr.arpa is delegated to two nameservers, however both delegated nameservers are missing in the zone. They are on different IP networks. art.ht, afnic.fr, sfinx.fr, afnic.net, mayotte.fr and at least 98 other hosts share nameservers with this domain. 57.194.in-addr.arpa is a domain controlled by three nameservers. All of them are on different IP networks.