105.51.193.in-addr.arpa is a domain controlled by three nameservers. All of them are on different IP networks. oca.eu, cma.fr, unice.fr, univmed.fr, cerfacs.fr and at least 100 other hosts share nameservers with this domain. 51.193.in-addr.arpa is a domain controlled by three nameservers. All of them are on different IP networks.