Summary
dns1.fpt.vn has one IP number , but the reverse is
isp-dns1.fpt.vn.
dns11.fpt.vn and
isp-dns1.fpt.vn point to the same IP.
vsd.vn,
fpt.vn,
btk.vn,
glr.vn,
vtv.vn and at least 100 other hosts use this as a nameserver.
fpt.vn is delegated to two nameservers, however both delegated nameservers are missing in the zone and two other nameservers are listed instead. All nameservers are at
fpt.vn themselves. Some of them are on the same IP network. Incoming mail for
fpt.vn is handled by two mailservers also at
fpt.vn. They are on the same IP network.
dns1.fpt.vn is hosted on a server in Vietnam.