Apex domains cannot have CNAME records.
Question and response
Question
dig korehosting.net. NS
Answer
korehosting.net. 4 NS ns3.korehosting.net.
korehosting.net. 4 NS ns1.korehosting.net.
korehosting.net. 4 NS ns2.korehosting.net.
Authority
The response has no authority records.
Additional
ns1.korehosting.net. 4 A 159.203.108.181
ns2.korehosting.net. 4 A 67.205.174.156
ns3.korehosting.net. 4 A 142.93.181.81
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0