static.vdc.vn has no CNAME records.
Question and response
Question
dig static.vdc.vn. NS
Answer
The response has no answer records.
Authority
vdc.vn. 1444 SOA ns-master.inet.vn. postmaster.inet.vn. 2015072800 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0