203.200-207.198.231.5.in-addr.arpa has no NS records.
NS records for this zone are defined at 200-207.198.231.5.in-addr.arpa.
NS records for this zone are defined at 200-207.198.231.5.in-addr.arpa.
Question and response
Question
dig 203.200-207.198.231.5.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
200-207.198.231.5.in-addr.arpa. 3600 SOA ns-a.ktk.de. hostmaster.noc.ktk.de. 2019052101 3600 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0