Apex domains cannot have CNAME records.
Question and response
Question
dig ucn.net. NS
Answer
ucn.net. 5 NS ns1.ucn.net.
ucn.net. 5 NS ns2.ucn.net.
Authority
The response has no authority records.
Additional
ns1.ucn.net. 5 A 199.172.8.221
ns2.ucn.net. 5 A 199.172.8.223
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0