static.vdc.vn has no NS records.
NS records for this zone are defined at vdc.vn.
NS records for this zone are defined at vdc.vn.
Question and response
Question
dig static.vdc.vn. NS
Answer
The response has no answer records.
Authority
vdc.vn. 3600 SOA ns-master.inet.vn. postmaster.inet.vn. 2015072800 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0