203.192.81.4.213.in-addr.arpa has no NS records.
NS records for this zone are defined at 192.81.4.213.in-addr.arpa.
NS records for this zone are defined at 192.81.4.213.in-addr.arpa.
Question and response
Question
dig 203.192.81.4.213.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
192.81.4.213.in-addr.arpa. 86400 SOA minerva.ttd.net. hostmaster.ttd.net. 2019042474 21600 7200 259200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0