Apex domains cannot have CNAME records.
Question and response
Question
dig spin.it. NS
Answer
spin.it. 2 NS down.spin.it.
spin.it. 2 NS strange.as6734.net.
spin.it. 2 NS up.spin.it.
Authority
The response has no authority records.
Additional
up.spin.it. 2 A 79.143.126.250
down.spin.it. 2 A 79.143.126.251
strange.as6734.net. 4 A 82.193.34.154
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0