mail.unj.ac.id has one IP number , via cname to go.domains.live.com , which also has a corresponding reverse pointer. 99v.cn, u86.com, dugn.net, jzvan.com, yjmdh.com and at least 100 other hosts point to the same IP. unj.ac.id is a domain controlled by two nameservers at telkom.net.id. They are on different IP networks. Incoming mail for unj.ac.id is handled by one mailserver having a total of two IP numbers. They are on the same IP network. unj.ac.id has one IP number. mail.unj.ac.id is hosted on a server in United States even though the hostname implies Indonesia.