utm.webport.de has no CNAME records.
Question and response
Question
dig utm.webport.de. NS
Answer
The response has no answer records.
Authority
webport.de. 3238 SOA ns1.webport.de. hostmaster.webport.de. 2025061002 28800 7200 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0