Apex domains cannot have CNAME records.
Question and response
Question
dig seppia.net. NS
Answer
seppia.net. 5 NS ns1.seppia.net.
seppia.net. 5 NS ns1.vittgam.net.
seppia.net. 5 NS ns2.seppia.net.
seppia.net. 5 NS ns2.vittgam.net.
Authority
The response has no authority records.
Additional
ns1.seppia.net. 5 A 78.47.77.12
ns1.vittgam.net. 5 A 213.239.197.142
ns2.seppia.net. 5 A 95.217.212.214
ns2.vittgam.net. 5 A 5.9.25.138
ns1.vittgam.net. 5 AAAA 2a01:4f8:130:5143:0:0:0:1
ns2.vittgam.net. 5 AAAA 2a01:4f8:161:483:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0