Apex domains cannot have CNAME records.
Question and response
Question
dig scheffel.it. NS
Answer
scheffel.it. 5 NS ns2.colordns.de.
scheffel.it. 5 NS ns1.colordns.de.
scheffel.it. 5 NS ns3.colordns.de.
Authority
The response has no authority records.
Additional
ns1.colordns.de. 5 A 213.9.14.107
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0