Apex domains cannot have CNAME records.
Question and response
Question
dig ax5z.com. NS
Answer
ax5z.com. 5 NS c.ax5z.com.
ax5z.com. 5 NS b.ax5z.com.
ax5z.com. 5 NS a.ax5z.com.
Authority
The response has no authority records.
Additional
a.ax5z.com. 5 A 185.5.81.1
b.ax5z.com. 5 A 185.5.81.2
c.ax5z.com. 5 A 91.236.122.129
a.ax5z.com. 5 AAAA 2a02:cb40:0:0:0:0:0:1
b.ax5z.com. 5 AAAA 2a02:cb40:100:0:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0