Apex domains cannot have CNAME records.
Question and response
Question
dig hinet.net. NS
Answer
hinet.net. 4 NS ans2.hinet.net.
hinet.net. 4 NS ans1.hinet.net.
hinet.net. 4 NS ans3.hinet.tw.
Authority
The response has no authority records.
Additional
ans1.hinet.net. 4 A 168.95.192.15
ans2.hinet.net. 4 A 203.74.116.215
ans1.hinet.net. 4 AAAA 2001:b000:168:0:0:1:100:1
ans2.hinet.net. 4 AAAA 2001:b000:180:80d:203:74:116:215
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0