Incoming mail for crc9.concentric.net is handled by one mailserver having a total of four IP numbers. All of them are on the same IP network. crc9.concentric.net has one IP number , which also has a corresponding reverse pointer. www.cris.com, radiusmc.com, crc6.cris.com, crc8.cris.com, crc2.cris.com and at least 99 other hosts share mailservers with this domain. concentric.net is a domain controlled by three nameservers at cnc.net. Two of them are on the same IP network. Incoming mail for concentric.net is handled by four mailservers also at cnc.net. All of them are on the same IP network. concentric.net has four IP numbers. All of them are on the same IP network. crc9.concentric.net is hosted on a server in United States.