Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-32.org. NS
Answer
awsdns-32.org. 5 NS g-ns-738.awsdns-32.org.
awsdns-32.org. 5 NS g-ns-1059.awsdns-32.org.
awsdns-32.org. 5 NS g-ns-1632.awsdns-32.org.
awsdns-32.org. 5 NS g-ns-160.awsdns-32.org.
Authority
The response has no authority records.
Additional
g-ns-160.awsdns-32.org. 5 A 205.251.192.160
g-ns-738.awsdns-32.org. 5 A 205.251.194.226
g-ns-1059.awsdns-32.org. 5 A 205.251.196.35
g-ns-1632.awsdns-32.org. 5 A 205.251.198.96
g-ns-160.awsdns-32.org. 5 AAAA 2600:9000:5300:a000:0:0:0:1
g-ns-738.awsdns-32.org. 5 AAAA 2600:9000:5302:e200:0:0:0:1
g-ns-1059.awsdns-32.org. 5 AAAA 2600:9000:5304:2300:0:0:0:1
g-ns-1632.awsdns-32.org. 5 AAAA 2600:9000:5306:6000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0