mail.ud.edu.vn has four IP numbers. All of them are on the same IP network. This hostname cnames to mail.live.com. mail.live.it, mail.live.com, mail.yxszx.com, www.hotmail.fr, www.hotmail.es and at least 24 other hosts point to the same IP. ud.edu.vn is a domain controlled by two nameservers at ud.edu.vn themselves. They are on the same IP network. Incoming mail for ud.edu.vn is handled by one mailserver having a total of two IP numbers. They are on the same IP network. mail.ud.edu.vn is hosted on four servers in United States even though the hostname implies Vietnam.