Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-32.com. NS
Answer
awsdns-32.com. 5 NS g-ns-33.awsdns-32.com.
awsdns-32.com. 5 NS g-ns-608.awsdns-32.com.
awsdns-32.com. 5 NS g-ns-1184.awsdns-32.com.
awsdns-32.com. 5 NS g-ns-1760.awsdns-32.com.
Authority
The response has no authority records.
Additional
g-ns-33.awsdns-32.com. 5 A 205.251.192.33
g-ns-608.awsdns-32.com. 5 A 205.251.194.96
g-ns-1184.awsdns-32.com. 5 A 205.251.196.160
g-ns-1760.awsdns-32.com. 5 A 205.251.198.224
g-ns-33.awsdns-32.com. 5 AAAA 2600:9000:5300:2100:0:0:0:1
g-ns-608.awsdns-32.com. 5 AAAA 2600:9000:5302:6000:0:0:0:1
g-ns-1184.awsdns-32.com. 5 AAAA 2600:9000:5304:a000:0:0:0:1
g-ns-1760.awsdns-32.com. 5 AAAA 2600:9000:5306:e000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0