Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-10.com. NS
Answer
awsdns-10.com. 5 NS g-ns-586.awsdns-10.com.
awsdns-10.com. 5 NS g-ns-1738.awsdns-10.com.
awsdns-10.com. 5 NS g-ns-11.awsdns-10.com.
awsdns-10.com. 5 NS g-ns-1162.awsdns-10.com.
Authority
The response has no authority records.
Additional
g-ns-11.awsdns-10.com. 5 A 205.251.192.11
g-ns-586.awsdns-10.com. 5 A 205.251.194.74
g-ns-1162.awsdns-10.com. 5 A 205.251.196.138
g-ns-1738.awsdns-10.com. 5 A 205.251.198.202
g-ns-11.awsdns-10.com. 5 AAAA 2600:9000:5300:b00:0:0:0:1
g-ns-586.awsdns-10.com. 5 AAAA 2600:9000:5302:4a00:0:0:0:1
g-ns-1162.awsdns-10.com. 5 AAAA 2600:9000:5304:8a00:0:0:0:1
g-ns-1738.awsdns-10.com. 5 AAAA 2600:9000:5306:ca00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0