Apex domains cannot have CNAME records.
Question and response
Question
dig yc.hn. NS
Answer
yc.hn. 5 NS ns.yc.hn.
Authority
The response has no authority records.
Additional
ns.yc.hn. 5 A 104.168.22.82
ns.yc.hn. 5 AAAA 2001:470:e901:0:0:0:0:0
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0