Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-35.org. NS
Answer
awsdns-35.org. 4 NS g-ns-741.awsdns-35.org.
awsdns-35.org. 4 NS g-ns-163.awsdns-35.org.
awsdns-35.org. 4 NS g-ns-1635.awsdns-35.org.
awsdns-35.org. 4 NS g-ns-1062.awsdns-35.org.
Authority
The response has no authority records.
Additional
g-ns-163.awsdns-35.org. 4 A 205.251.192.163
g-ns-741.awsdns-35.org. 4 A 205.251.194.229
g-ns-1062.awsdns-35.org. 4 A 205.251.196.38
g-ns-1635.awsdns-35.org. 4 A 205.251.198.99
g-ns-163.awsdns-35.org. 4 AAAA 2600:9000:5300:a300:0:0:0:1
g-ns-741.awsdns-35.org. 4 AAAA 2600:9000:5302:e500:0:0:0:1
g-ns-1062.awsdns-35.org. 4 AAAA 2600:9000:5304:2600:0:0:0:1
g-ns-1635.awsdns-35.org. 4 AAAA 2600:9000:5306:6300:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0