deneb.dfn.de has no NS records.
NS records for this zone are defined at dfn.de.
NS records for this zone are defined at dfn.de.
Question and response
Question
dig deneb.dfn.de. NS
Answer
The response has no answer records.
Authority
dfn.de. 3600 SOA ns1.dfn.de. hostmaster.dfn.de. 1771508186 28800 7200 3024000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0