mail.anp.cl has one IP number , but the reverse is ns.altavoz.cl. tyt.cl, dgm.cl, high.cl, cfin.cl, cspnq.cl and at least 100 other hosts point to the same IP. anp.cl use this as a mailserver. anp.cl is delegated to three nameservers, however one delegated nameserver is missing in the zone. Two of them are on the same IP network. Incoming mail for anp.cl is handled by one mailserver at anp.cl themselves. anp.cl has one IP number. mail.anp.cl is hosted on a server in Chile.