30.136.190.91.in-addr.arpa has no NS records.
NS records for this zone are defined at 136.190.91.in-addr.arpa.
NS records for this zone are defined at 136.190.91.in-addr.arpa.
Question and response
Question
dig 30.136.190.91.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
136.190.91.in-addr.arpa. 38400 SOA ns01.kustbandet.com. hostmaster.kustbandet.com. 1179751199 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0