mx4.bora.net has one IP number , which also has a corresponding reverse pointer. mx4.lgdacom.net and mx4.dacom.co.kr point to the same IP. bora.net is a domain controlled by three nameservers at lgdacom.net. Two of them are on the same IP network. Incoming mail for bora.net is handled by one mailserver at bora.net themselves. bora.net has one IP number. mx4.bora.net is hosted on a server in Korea.