Apex domains cannot have CNAME records.
Question and response
Question
dig dnswnd.be. NS
Answer
dnswnd.be. 3 NS ns-928.awsdns-52.net.
dnswnd.be. 3 NS ns-2031.awsdns-61.co.uk.
dnswnd.be. 3 NS ns-279.awsdns-34.com.
dnswnd.be. 3 NS ns-1377.awsdns-44.org.
Authority
The response has no authority records.
Additional
ns-279.awsdns-34.com. 4 A 205.251.193.23
ns-928.awsdns-52.net. 4 A 205.251.195.160
ns-1377.awsdns-44.org. 4 A 205.251.197.97
ns-2031.awsdns-61.co.uk. 4 A 205.251.199.239
ns-279.awsdns-34.com. 4 AAAA 2600:9000:5301:1700:0:0:0:1
ns-928.awsdns-52.net. 4 AAAA 2600:9000:5303:a000:0:0:0:1
ns-1377.awsdns-44.org. 4 AAAA 2600:9000:5305:6100:0:0:0:1
ns-2031.awsdns-61.co.uk. 4 AAAA 2600:9000:5307:ef00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0