mail.drbiz.net has one IP number , which is the same as for drbiz.net, but the reverse is cpanel5.velcom.com. drbiz.net, haxxx.net, teiko.net, mioya.com, vixei.com and at least 100 other hosts point to the same IP. drbiz.net use this as a mailserver. drbiz.net is delegated to two nameservers, however one delegated nameserver is missing in the zone and one other nameserver is listed instead. All nameservers are at velcom.com. All of them are on different IP networks. Incoming mail for drbiz.net is handled by one mailserver at drbiz.net themselves. mail.drbiz.net is hosted on a server in Canada.