Apex domains cannot have CNAME records.
Question and response
Question
dig pibit.ch. NS
Answer
pibit.ch. 5 NS dragon.pibit.ch.
pibit.ch. 5 NS b.ns14.net.
Authority
The response has no authority records.
Additional
b.ns14.net. 3 A 217.160.81.160
b.ns14.net. 3 AAAA 2001:8d8:fe:53:217:160:81:160
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0