api.prod.cloud.gwdg.de has no NS records.
NS records for this zone are defined at prod.cloud.gwdg.de.
NS records for this zone are defined at prod.cloud.gwdg.de.
Question and response
Question
dig api.prod.cloud.gwdg.de. NS
Answer
The response has no answer records.
Authority
prod.cloud.gwdg.de. 60 SOA dns1.gwdg.de. hostmaster.gwdg.de. 679233809 21600 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0