ns1.ddnss.de has no CNAME records.
Question and response
Question
dig ns1.ddnss.de. NS
Answer
The response has no answer records.
Authority
ddnss.de. 60 SOA ns1.ddnss.de. postmaster.megacomputing.de. 2061357537 3600 7200 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0