ns2.fucloud.de has no CNAME records.
Question and response
Question
dig ns2.fucloud.de. NS
Answer
The response has no answer records.
Authority
fucloud.de. 170 SOA dnsmaster.fucloud.de. hostmaster.b4ne.de. 2026021602 14400 1800 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0