232.128-255.56.217.74.in-addr.arpa has no NS records.
NS records for this zone are defined at 128-255.56.217.74.in-addr.arpa.
NS records for this zone are defined at 128-255.56.217.74.in-addr.arpa.
Question and response
Question
dig 232.128-255.56.217.74.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
128-255.56.217.74.in-addr.arpa. 900 SOA ns-707.awsdns-24.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 360
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0