4.0-24.8.66.216.in-addr.arpa has no NS records.
NS records for this zone are defined at 0-24.8.66.216.in-addr.arpa.
NS records for this zone are defined at 0-24.8.66.216.in-addr.arpa.
Question and response
Question
dig 4.0-24.8.66.216.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
0-24.8.66.216.in-addr.arpa. 2560 SOA ns1.discourse.cloud. hostmaster.discourse.org. 1774582561 16384 2048 1048576 2560
Additional
The response has no additional records.