addr43.addr.com has one IP number , which also has a corresponding reverse pointer. ifrw.net, cpof.org, sgphw.ch, bssn.net, isbmc.net and at least 100 other hosts point to the same IP. addr.com is a domain controlled by two nameservers at addr.com themselves. They are on the same IP network. Incoming mail for addr.com is handled by four mailservers also at addr.com. All of them are on the same IP network. addr.com has one IP number. addr43.addr.com is hosted on a server in United States.