92.48.146.in-addr.arpa is a domain controlled by two nameservers on different IP networks. w3c.it, nic.it, xml.it, ccr.it, mi.cnr.it and at least 58 other hosts share nameservers with this domain. 48.146.in-addr.arpa is a domain controlled by five nameservers. Two of them are on the same IP network.