gns04.edge-dns.de has no CNAME records.
Question and response
Question
dig gns04.edge-dns.de. NS
Answer
The response has no answer records.
Authority
edge-dns.de. 1800 SOA ns01.everscale-dns.com. postmaster.edge-dns.de. 2022040002 14400 604800 3600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0