231.128-255.24.37.212.in-addr.arpa has no NS records.
NS records for this zone are defined at 128-255.24.37.212.in-addr.arpa.
NS records for this zone are defined at 128-255.24.37.212.in-addr.arpa.
Question and response
Question
dig 231.128-255.24.37.212.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
128-255.24.37.212.in-addr.arpa. 3600 SOA dns-master.wx3.se. registry.wx3.se. 35 14400 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0