network-mnt.0011.de has no CNAME records.
Question and response
Question
dig network-mnt.0011.de. NS
Answer
The response has no answer records.
Authority
0011.de. 3600 SOA ns.inwx.de. hostmaster.inwx.de. 2026022113 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0