mailgo3.tot.co.th has no NS records.
NS records for this zone are defined at tot.co.th.
NS records for this zone are defined at tot.co.th.
Question and response
Question
dig mailgo3.tot.co.th. NS
Answer
The response has no answer records.
Authority
tot.co.th. 900 SOA idns1.intranet.tot.co.th. nsmaster.tot.co.th. 1031 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0