fml.symphony.net.th has no NS records.
NS records for this zone are defined at symphony.net.th.
NS records for this zone are defined at symphony.net.th.
Question and response
Question
dig fml.symphony.net.th. NS
Answer
The response has no answer records.
Authority
symphony.net.th. 600 SOA viola.violin.co.th. nip.symphony.net.th. 2018021490 180 60 240 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0