Apex domains cannot have CNAME records.
Question and response
Question
dig imn.ch. NS
Answer
imn.ch. 5 NS ns1.mailprofiler.ch.
imn.ch. 5 NS ns2.superhosting.cz.
Authority
The response has no authority records.
Additional
ns1.mailprofiler.ch. 5 A 95.168.208.129
ns2.superhosting.cz. 5 A 88.86.116.42
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0