smtp.dslplus.net.pk has no NS records.
NS records for this zone are defined at dslplus.net.pk.
NS records for this zone are defined at dslplus.net.pk.
Question and response
Question
dig smtp.dslplus.net.pk. NS
Answer
The response has no answer records.
Authority
dslplus.net.pk. 21600 SOA ns.link.net.pk. hostmaster.link.net.pk. 2019010905 10800 7200 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0