dilbert.selfhost.de has no NS records.
NS records for this zone are defined at selfhost.de.
NS records for this zone are defined at selfhost.de.
Question and response
Question
dig dilbert.selfhost.de. NS
Answer
The response has no answer records.
Authority
selfhost.de. 2560 SOA pri.selfhost.de. hostmaster.selfhost.de. 1772358446 16384 2048 1048576 2560
Additional
The response has no additional records.