Apex domains cannot have CNAME records.
Question and response
Question
dig oninferno.net. NS
Answer
oninferno.net. 2 NS ns-2017.awsdns-60.co.uk.
oninferno.net. 2 NS ns-943.awsdns-53.net.
oninferno.net. 2 NS ns-73.awsdns-09.com.
oninferno.net. 2 NS ns-1046.awsdns-02.org.
Authority
The response has no authority records.
Additional
ns-73.awsdns-09.com. 3 A 205.251.192.73
ns-1046.awsdns-02.org. 3 A 205.251.196.22
ns-2017.awsdns-60.co.uk. 3 A 205.251.199.225
ns-73.awsdns-09.com. 3 AAAA 2600:9000:5300:4900:0:0:0:1
ns-1046.awsdns-02.org. 3 AAAA 2600:9000:5304:1600:0:0:0:1
ns-2017.awsdns-60.co.uk. 3 AAAA 2600:9000:5307:e100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0