nsb9.schlundtech.de has no CNAME records.
Question and response
Question
dig nsb9.schlundtech.de. NS
Answer
The response has no answer records.
Authority
schlundtech.de. 9961 SOA any1.nodesecure.com. hostmaster.schlundtech.de. 2025051516 39940 14400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0