30.206.130.in-addr.arpa is a domain controlled by three nameservers. All of them are on the same IP network. uv.es, ub.es, bt.es, udc.es, iac.es and at least 50 other hosts share nameservers with this domain. es.30.206.130.in-addr.arpa are subdomains to this hostname. 206.130.in-addr.arpa is a domain controlled by four nameservers having a total of five IP numbers. Some of them are on the same IP network.