Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-61.net. NS
Answer
awsdns-61.net. 5 NS g-ns-831.awsdns-61.net.
awsdns-61.net. 5 NS g-ns-1981.awsdns-61.net.
awsdns-61.net. 5 NS g-ns-510.awsdns-61.net.
awsdns-61.net. 5 NS g-ns-1405.awsdns-61.net.
Authority
The response has no authority records.
Additional
g-ns-510.awsdns-61.net. 5 A 205.251.193.254
g-ns-831.awsdns-61.net. 5 A 205.251.195.63
g-ns-1405.awsdns-61.net. 5 A 205.251.197.125
g-ns-1981.awsdns-61.net. 5 A 205.251.199.189
g-ns-510.awsdns-61.net. 5 AAAA 2600:9000:5301:fe00:0:0:0:1
g-ns-831.awsdns-61.net. 5 AAAA 2600:9000:5303:3f00:0:0:0:1
g-ns-1405.awsdns-61.net. 5 AAAA 2600:9000:5305:7d00:0:0:0:1
g-ns-1981.awsdns-61.net. 5 AAAA 2600:9000:5307:bd00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0