Apex domains cannot have CNAME records.
Question and response
Question
dig ia64.org. NS
Answer
ia64.org. 4 NS keenan.ns.cloudflare.com.
ia64.org. 4 NS nancy.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0