Apex domains cannot have CNAME records.
Question and response
Question
dig aput.net. NS
Answer
aput.net. 3 NS dns1.aput.net.
aput.net. 3 NS dns2.aput.net.
Authority
The response has no authority records.
Additional
dns1.aput.net. 3 A 178.62.250.107
dns2.aput.net. 3 A 138.197.139.207
dns1.aput.net. 3 AAAA 2a03:b0c0:2:d0:0:0:16:7001
dns2.aput.net. 3 AAAA 2604:a880:cad:d0:0:0:563:8001
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0