Apex domains cannot have CNAME records.
Question and response
Question
dig n2.i8k.net. NS
Answer
n2.i8k.net. 5 NS n2.i8k.net.
n2.i8k.net. 5 NS n1.i8k.net.
Authority
The response has no authority records.
Additional
n1.i8k.net. 5 A 170.249.213.219
n2.i8k.net. 5 A 170.249.213.220
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0