Apex domains cannot have CNAME records.
Question and response
Question
dig asia. NS
Answer
asia. 5 NS a0.asia.afilias-nst.info.
asia. 5 NS b2.asia.afilias-nst.org.
asia. 5 NS c0.asia.afilias-nst.info.
asia. 5 NS a2.asia.afilias-nst.info.
asia. 5 NS b0.asia.afilias-nst.asia.
asia. 5 NS d0.asia.afilias-nst.asia.
Authority
The response has no authority records.
Additional
a0.asia.afilias-nst.info. 5 A 199.19.55.1
b0.asia.afilias-nst.asia. 74026 A 199.254.28.1
c0.asia.afilias-nst.info. 5 A 199.254.29.1
d0.asia.afilias-nst.asia. 74026 A 199.254.30.1
a0.asia.afilias-nst.info. 5 AAAA 2001:500:d:0:0:0:0:1
b0.asia.afilias-nst.asia. 74026 AAAA 2001:500:16:0:0:0:0:1
c0.asia.afilias-nst.info. 5 AAAA 2001:500:17:0:0:0:0:1
d0.asia.afilias-nst.asia. 74026 AAAA 2001:500:18:0:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0