nyc.xac.net is delegated to two nameservers, however both delegated nameservers are missing in the zone. All nameservers are at messagingengine.com. They are on different IP networks. ewiz.ca, xac.net, ner.com, sent.com, ccso.net and at least 58 other hosts share nameservers with this domain. ip166.nyc.xac.net, ip163.nyc.xac.net and ip164.nyc.xac.net are subdomains to this hostname. xac.net is a domain controlled by two nameservers also at messagingengine.com. They are on different IP networks. Incoming mail for xac.net is handled by two mailservers having a total of seven IP numbers. Some of them are on the same IP network. xac.net has two IP numbers. They are on the same IP network.