Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-17.org. NS
Answer
awsdns-17.org. 5 NS g-ns-723.awsdns-17.org.
awsdns-17.org. 5 NS g-ns-1617.awsdns-17.org.
awsdns-17.org. 5 NS g-ns-145.awsdns-17.org.
awsdns-17.org. 5 NS g-ns-1044.awsdns-17.org.
Authority
The response has no authority records.
Additional
g-ns-145.awsdns-17.org. 5 A 205.251.192.145
g-ns-723.awsdns-17.org. 5 A 205.251.194.211
g-ns-1044.awsdns-17.org. 5 A 205.251.196.20
g-ns-1617.awsdns-17.org. 5 A 205.251.198.81
g-ns-145.awsdns-17.org. 5 AAAA 2600:9000:5300:9100:0:0:0:1
g-ns-723.awsdns-17.org. 5 AAAA 2600:9000:5302:d300:0:0:0:1
g-ns-1044.awsdns-17.org. 5 AAAA 2600:9000:5304:1400:0:0:0:1
g-ns-1617.awsdns-17.org. 5 AAAA 2600:9000:5306:5100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0