233.143.91-QoS-smaug.in-addr.arpa has no NS records.
NS records for this zone are defined at in-addr.arpa.
NS records for this zone are defined at in-addr.arpa.
Question and response
Question
dig 233.143.91-QoS-smaug.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
in-addr.arpa. 3600 SOA b.in-addr-servers.arpa. nstld.iana.org. 2026022270 1800 900 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0