mail.clauss.us has one IP number , but the reverse is smtp.secureserver.net. cblb.net, abate.net, smtp.40.com, bepcusa.com, bnflusa.com and at least 100 other hosts point to the same IP. breadnm.org use this as a mailserver. clauss.us is delegated to two nameservers, however both delegated nameservers are missing in the zone and one other nameserver is listed. All nameservers are at clauss.us themselves. There are two duplicated IP numbers. Incoming mail for clauss.us is handled by three mailservers. All of them are on different IP networks. clauss.us has one IP number , which also has a corresponding reverse pointer. mail.clauss.us is hosted on a server in United States.