cpanel03mh.bkk1.cloud.z.com has no NS records.
NS records for this zone are defined at bkk1.cloud.z.com.
NS records for this zone are defined at bkk1.cloud.z.com.
Question and response
Question
dig cpanel03mh.bkk1.cloud.z.com. NS
Answer
The response has no answer records.
Authority
bkk1.cloud.z.com. 3600 SOA ns-a1.zc-dns.com. postmaster.example.com. 1756971324 3600 600 86400 3600
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0