de.ch-inter.net has no CNAME records.
Question and response
Question
dig de.ch-inter.net. NS
Answer
The response has no answer records.
Authority
ch-inter.net. 326 SOA ch.pro.io. hostmaster.metanet.ch. 2025090803 14400 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0