Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-09.net. NS
Answer
awsdns-09.net. 5 NS g-ns-1929.awsdns-09.net.
awsdns-09.net. 5 NS g-ns-1353.awsdns-09.net.
awsdns-09.net. 5 NS g-ns-458.awsdns-09.net.
awsdns-09.net. 5 NS g-ns-779.awsdns-09.net.
Authority
The response has no authority records.
Additional
g-ns-458.awsdns-09.net. 5 A 205.251.193.202
g-ns-779.awsdns-09.net. 5 A 205.251.195.11
g-ns-1353.awsdns-09.net. 5 A 205.251.197.73
g-ns-1929.awsdns-09.net. 5 A 205.251.199.137
g-ns-458.awsdns-09.net. 5 AAAA 2600:9000:5301:ca00:0:0:0:1
g-ns-779.awsdns-09.net. 5 AAAA 2600:9000:5303:b00:0:0:0:1
g-ns-1353.awsdns-09.net. 5 AAAA 2600:9000:5305:4900:0:0:0:1
g-ns-1929.awsdns-09.net. 5 AAAA 2600:9000:5307:8900:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0