138.128-28.75.174.193.in-addr.arpa has no NS records.
NS records for this zone are defined at 128-28.75.174.193.in-addr.arpa.
NS records for this zone are defined at 128-28.75.174.193.in-addr.arpa.
Question and response
Question
dig 138.128-28.75.174.193.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
128-28.75.174.193.in-addr.arpa. 86400 SOA ns1.dfn.de. hostmaster.dfn.de. 1753974426 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0