Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-05.net. NS
Answer
awsdns-05.net. 5 NS g-ns-454.awsdns-05.net.
awsdns-05.net. 5 NS g-ns-1349.awsdns-05.net.
awsdns-05.net. 5 NS g-ns-775.awsdns-05.net.
awsdns-05.net. 5 NS g-ns-1925.awsdns-05.net.
Authority
The response has no authority records.
Additional
g-ns-454.awsdns-05.net. 5 A 205.251.193.198
g-ns-775.awsdns-05.net. 5 A 205.251.195.7
g-ns-1349.awsdns-05.net. 5 A 205.251.197.69
g-ns-1925.awsdns-05.net. 5 A 205.251.199.133
g-ns-454.awsdns-05.net. 5 AAAA 2600:9000:5301:c600:0:0:0:1
g-ns-775.awsdns-05.net. 5 AAAA 2600:9000:5303:700:0:0:0:1
g-ns-1349.awsdns-05.net. 5 AAAA 2600:9000:5305:4500:0:0:0:1
g-ns-1925.awsdns-05.net. 5 AAAA 2600:9000:5307:8500:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0