Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-11.org. NS
Answer
awsdns-11.org. 5 NS g-ns-1038.awsdns-11.org.
awsdns-11.org. 5 NS g-ns-139.awsdns-11.org.
awsdns-11.org. 5 NS g-ns-717.awsdns-11.org.
awsdns-11.org. 5 NS g-ns-1611.awsdns-11.org.
Authority
The response has no authority records.
Additional
g-ns-139.awsdns-11.org. 5 A 205.251.192.139
g-ns-717.awsdns-11.org. 5 A 205.251.194.205
g-ns-1038.awsdns-11.org. 5 A 205.251.196.14
g-ns-1611.awsdns-11.org. 5 A 205.251.198.75
g-ns-139.awsdns-11.org. 5 AAAA 2600:9000:5300:8b00:0:0:0:1
g-ns-717.awsdns-11.org. 5 AAAA 2600:9000:5302:cd00:0:0:0:1
g-ns-1038.awsdns-11.org. 5 AAAA 2600:9000:5304:e00:0:0:0:1
g-ns-1611.awsdns-11.org. 5 AAAA 2600:9000:5306:4b00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0