Apex domains cannot have CNAME records.
Question and response
Question
dig worldofwindsurfing.net. NS
Answer
worldofwindsurfing.net. 5 NS ns-81.awsdns-10.com.
worldofwindsurfing.net. 5 NS ns-825.awsdns-39.net.
worldofwindsurfing.net. 5 NS ns-889.awsdns-47.net.
worldofwindsurfing.net. 5 NS ns-972.awsdns-57.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0