slave.btcl.net.bd has no NS records.
NS records for this zone are defined at btcl.net.bd.
NS records for this zone are defined at btcl.net.bd.
Question and response
Question
dig slave.btcl.net.bd. NS
Answer
The response has no answer records.
Authority
btcl.net.bd. 900 SOA dns.btcl.net.bd. slave.btcl.net.bd. 2023061928 1200 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0