master.smilexd.co.th has no NS records.
NS records for this zone are defined at smilexd.co.th.
NS records for this zone are defined at smilexd.co.th.
Question and response
Question
dig master.smilexd.co.th. NS
Answer
The response has no answer records.
Authority
smilexd.co.th. 1800 SOA joan.ns.cloudflare.com. dns.cloudflare.com. 2397570871 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0