3.0-15.20.97.80.in-addr.arpa has no NS records.
NS records for this zone are defined at 0-15.20.97.80.in-addr.arpa.
NS records for this zone are defined at 0-15.20.97.80.in-addr.arpa.
Question and response
Question
dig 3.0-15.20.97.80.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
0-15.20.97.80.in-addr.arpa. 3600 SOA ns1.radiocom.ro. root.ns1.radiocom.ro. 2005080302 28800 7200 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0