Ptr81.lnh.edu.pk has no NS records.
NS records for this zone are defined at lnh.edu.pk.
NS records for this zone are defined at lnh.edu.pk.
Question and response
Question
dig Ptr81.lnh.edu.pk. NS
Answer
The response has no answer records.
Authority
lnh.edu.pk. 1800 SOA julio.ns.cloudflare.com. dns.cloudflare.com. 2397929450 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0