Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-04.net. NS
Answer
awsdns-04.net. 5 NS g-ns-453.awsdns-04.net.
awsdns-04.net. 5 NS g-ns-1924.awsdns-04.net.
awsdns-04.net. 5 NS g-ns-1348.awsdns-04.net.
awsdns-04.net. 5 NS g-ns-774.awsdns-04.net.
Authority
The response has no authority records.
Additional
g-ns-453.awsdns-04.net. 5 A 205.251.193.197
g-ns-774.awsdns-04.net. 5 A 205.251.195.6
g-ns-1348.awsdns-04.net. 5 A 205.251.197.68
g-ns-1924.awsdns-04.net. 5 A 205.251.199.132
g-ns-453.awsdns-04.net. 5 AAAA 2600:9000:5301:c500:0:0:0:1
g-ns-774.awsdns-04.net. 5 AAAA 2600:9000:5303:600:0:0:0:1
g-ns-1348.awsdns-04.net. 5 AAAA 2600:9000:5305:4400:0:0:0:1
g-ns-1924.awsdns-04.net. 5 AAAA 2600:9000:5307:8400:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0