201.251.63.in-addr.arpa is delegated to two nameservers, however both delegated nameservers are missing in the zone and four other nameservers are listed. Some of them are on the same IP network. ws, dns.ws, org.ws, com.ws, gov.ws and at least 27 other hosts share nameservers with this domain. 6.201.251.63.in-addr.arpa are subdomains to this hostname. 251.63.in-addr.arpa is a domain controlled by two nameservers at pnap.net. They are on the same IP network.