cu30roau03.rinc.net has one IP number , which also has a corresponding reverse pointer. c-ml.com, rgts.com, rgts.net, rinc.net, fchs.com and at least 100 other hosts use this as a nameserver. rinc.net is a domain controlled by three nameservers at rinc.net themselves. All of them are on different IP networks. Incoming mail for rinc.net is handled by one mailserver also at rinc.net. cu30roau03.rinc.net is hosted on a server in United States.