vol.vnn.vn is a domain controlled by two nameservers at vasc.com.vn. They are on different IP networks. Incoming mail for vol.vnn.vn is handled by one mailserver at vol.vnn.vn themselves. coc.vn, ttol.vn, sime.vn, buddy.vn, 123sms.vn and at least 55 other hosts share nameservers with this domain. smtp.vol.vnn.vn and vnonline.vol.vnn.vn are subdomains to this hostname. vnn.vn is a domain controlled by two nameservers at vnn.vn themselves. They are on different IP networks. Incoming mail for vnn.vn is handled by two mailservers having a total of 15 IP numbers. Some of them are on the same IP network.