Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-06.net. NS
Answer
awsdns-06.net. 5 NS g-ns-776.awsdns-06.net.
awsdns-06.net. 5 NS g-ns-455.awsdns-06.net.
awsdns-06.net. 5 NS g-ns-1926.awsdns-06.net.
awsdns-06.net. 5 NS g-ns-1350.awsdns-06.net.
Authority
The response has no authority records.
Additional
g-ns-455.awsdns-06.net. 5 A 205.251.193.199
g-ns-776.awsdns-06.net. 5 A 205.251.195.8
g-ns-1350.awsdns-06.net. 5 A 205.251.197.70
g-ns-1926.awsdns-06.net. 5 A 205.251.199.134
g-ns-455.awsdns-06.net. 5 AAAA 2600:9000:5301:c700:0:0:0:1
g-ns-776.awsdns-06.net. 5 AAAA 2600:9000:5303:800:0:0:0:1
g-ns-1350.awsdns-06.net. 5 AAAA 2600:9000:5305:4600:0:0:0:1
g-ns-1926.awsdns-06.net. 5 AAAA 2600:9000:5307:8600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0