Incoming mail for mx1.irbs.com is handled by one mailserver having a total of three IP numbers. All of them are on the same IP network. mx1.irbs.com has one IP number , but the reverse is mx1.mxes.net. mx1.mxes.net, mail.gloc.org, mxin.mxes.net, mail.wandd.net, mail.kadova.net and at least 33 other hosts point to the same IP. suze.net use this as a mailserver. xmy.ca, ii.com, mpp.org, ion1.com, ibsn.com and at least 100 other hosts share mailservers with this domain. irbs.com is a domain controlled by two nameservers at irbs.net. They are on different IP networks. Incoming mail for irbs.com is handled by two mailservers having a total of four IP numbers. All of them are on the same IP network. irbs.com has one IP number. mx1.irbs.com is hosted on a server in United States.