ns3.happy.co.th has no NS records.
NS records for this zone are defined at happy.co.th.
NS records for this zone are defined at happy.co.th.
Question and response
Question
dig ns3.happy.co.th. NS
Answer
The response has no answer records.
Authority
happy.co.th. 600 SOA ns5.dtac.co.th. please_set_email.absolutely.nowhere. 2018121818 1800 600 2592000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0