Apex domains cannot have CNAME records.
Question and response
Question
dig baeretswil.org. NS
Answer
baeretswil.org. 5 NS dns3.i-web.ch.
baeretswil.org. 5 NS dns1.i-web.ch.
baeretswil.org. 5 NS dns2.i-web.ch.
Authority
The response has no authority records.
Additional
dns1.i-web.ch. 5 A 195.65.10.66
dns3.i-web.ch. 5 A 195.65.10.65
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0