relay04.netnam.vn has no NS records.
NS records for this zone are defined at netnam.vn.
NS records for this zone are defined at netnam.vn.
Question and response
Question
dig relay04.netnam.vn. NS
Answer
The response has no answer records.
Authority
netnam.vn. 3600 SOA ns1.netnam.vn. root.ns1.netnam.vn. 2008122960 28800 14400 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0