Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-38.org. NS
Answer
awsdns-38.org. 5 NS g-ns-166.awsdns-38.org.
awsdns-38.org. 5 NS g-ns-1065.awsdns-38.org.
awsdns-38.org. 5 NS g-ns-744.awsdns-38.org.
awsdns-38.org. 5 NS g-ns-1638.awsdns-38.org.
Authority
The response has no authority records.
Additional
g-ns-166.awsdns-38.org. 5 A 205.251.192.166
g-ns-744.awsdns-38.org. 5 A 205.251.194.232
g-ns-1065.awsdns-38.org. 5 A 205.251.196.41
g-ns-1638.awsdns-38.org. 5 A 205.251.198.102
g-ns-166.awsdns-38.org. 5 AAAA 2600:9000:5300:a600:0:0:0:1
g-ns-744.awsdns-38.org. 5 AAAA 2600:9000:5302:e800:0:0:0:1
g-ns-1065.awsdns-38.org. 5 AAAA 2600:9000:5304:2900:0:0:0:1
g-ns-1638.awsdns-38.org. 5 AAAA 2600:9000:5306:6600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0