Apex domains cannot have CNAME records.
Question and response
Question
dig kapper.net. NS
Answer
kapper.net. 5 NS ns2.kapper.net.
kapper.net. 5 NS ns8.kapper.net.
kapper.net. 5 NS ns1.kapper.net.
kapper.net. 5 NS ns7.kapper.net.
kapper.net. 5 NS ns6.kapper.net.
kapper.net. 5 NS ns3.kapper.net.
kapper.net. 5 NS ns5.kapper.net.
kapper.net. 5 NS ns4.kapper.net.
Authority
The response has no authority records.
Additional
ns1.kapper.net. 5 A 94.136.1.127
ns2.kapper.net. 5 A 94.16.111.51
ns3.kapper.net. 5 A 103.241.67.58
ns4.kapper.net. 5 A 139.99.239.52
ns5.kapper.net. 5 A 94.136.22.5
ns6.kapper.net. 5 A 97.74.83.192
ns7.kapper.net. 5 A 144.217.92.144
ns8.kapper.net. 5 A 195.200.6.20
ns1.kapper.net. 5 AAAA 2a02:ab8:4:0:0:0:0:11
ns2.kapper.net. 5 AAAA 2a03:4000:51:f2e:0:0:0:51
ns4.kapper.net. 5 AAAA 2402:1f00:8100:400:0:0:0:14ce
ns5.kapper.net. 5 AAAA 2a02:ab8:4:0:0:0:0:5
ns7.kapper.net. 5 AAAA 2607:5300:201:3100:0:0:0:4caf
ns8.kapper.net. 5 AAAA 2a02:4780:14:aa53:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0