mforward.dtag.de has no CNAME records.
Question and response
Question
dig mforward.dtag.de. NS
Answer
The response has no answer records.
Authority
dtag.de. 8171 SOA pns.dtag.de. dns.telekom.de. 2025062401 10000 1800 3600000 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0