groups.google.com.vn has two IP numbers. They are on the same IP network. This hostname cnames to groups.google.com. goo.gl, dev.jot.com, x66.deja.com, www.deja.com, panoramio.com and at least 56 other hosts point to the same IP. google.com.vn is delegated to three nameservers, however one extra nameserver is listed in the zone. All nameservers are at google.com. All of them are on different IP networks. Incoming mail for google.com.vn is handled by four mailservers. All of them are on the same IP network. google.com.vn has six IP numbers. All of them are on the same IP network. groups.google.com.vn is hosted on two servers in United States even though the hostname implies Vietnam.