Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-45.net. NS
Answer
awsdns-45.net. 5 NS g-ns-815.awsdns-45.net.
awsdns-45.net. 5 NS g-ns-494.awsdns-45.net.
awsdns-45.net. 5 NS g-ns-1965.awsdns-45.net.
awsdns-45.net. 5 NS g-ns-1389.awsdns-45.net.
Authority
The response has no authority records.
Additional
g-ns-494.awsdns-45.net. 5 A 205.251.193.238
g-ns-815.awsdns-45.net. 5 A 205.251.195.47
g-ns-1389.awsdns-45.net. 5 A 205.251.197.109
g-ns-1965.awsdns-45.net. 5 A 205.251.199.173
g-ns-494.awsdns-45.net. 5 AAAA 2600:9000:5301:ee00:0:0:0:1
g-ns-815.awsdns-45.net. 5 AAAA 2600:9000:5303:2f00:0:0:0:1
g-ns-1389.awsdns-45.net. 5 AAAA 2600:9000:5305:6d00:0:0:0:1
g-ns-1965.awsdns-45.net. 5 AAAA 2600:9000:5307:ad00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0