Apex domains cannot have CNAME records.
Question and response
Question
dig ciberserver.com. NS
Answer
ciberserver.com. 5 NS ns3.ciberserver.net.
ciberserver.com. 5 NS ns1.ciberserver.com.
ciberserver.com. 5 NS ns2.ciberserver.net.
ciberserver.com. 5 NS ns1.ciberserver.net.
ciberserver.com. 5 NS ns2.ciberserver.com.
ciberserver.com. 5 NS ns3.ciberserver.com.
Authority
The response has no authority records.
Additional
ns1.ciberserver.com. 5 A 185.162.183.86
ns2.ciberserver.com. 5 A 193.163.151.105
ns3.ciberserver.com. 5 A 82.215.71.10
ns1.ciberserver.com. 5 AAAA 2001:b18:1002:200:0:0:0:88
ns2.ciberserver.com. 5 AAAA 2a0e:5f00:1:0:0:0:0:a0
ns3.ciberserver.com. 5 AAAA 2001:b18:1031:200:0:0:0:10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0