sysdb.pacific.net.th has no NS records.
NS records for this zone are defined at pacific.net.th.
NS records for this zone are defined at pacific.net.th.
Question and response
Question
dig sysdb.pacific.net.th. NS
Answer
The response has no answer records.
Authority
pacific.net.th. 300 SOA ns1.pacific.net.th. postmaster.ns1.pacific.net.th. 2026022000 21600 1800 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0