Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-54.net. NS
Answer
awsdns-54.net. 5 NS g-ns-503.awsdns-54.net.
awsdns-54.net. 5 NS g-ns-1974.awsdns-54.net.
awsdns-54.net. 5 NS g-ns-1398.awsdns-54.net.
awsdns-54.net. 5 NS g-ns-824.awsdns-54.net.
Authority
The response has no authority records.
Additional
g-ns-503.awsdns-54.net. 5 A 205.251.193.247
g-ns-824.awsdns-54.net. 5 A 205.251.195.56
g-ns-1398.awsdns-54.net. 5 A 205.251.197.118
g-ns-1974.awsdns-54.net. 5 A 205.251.199.182
g-ns-503.awsdns-54.net. 5 AAAA 2600:9000:5301:f700:0:0:0:1
g-ns-824.awsdns-54.net. 5 AAAA 2600:9000:5303:3800:0:0:0:1
g-ns-1398.awsdns-54.net. 5 AAAA 2600:9000:5305:7600:0:0:0:1
g-ns-1974.awsdns-54.net. 5 AAAA 2600:9000:5307:b600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0