Apex domains cannot have CNAME records.
Question and response
Question
dig hiper.dk. NS
Answer
hiper.dk. 4 NS ns-571.awsdns-07.net.
hiper.dk. 4 NS ns-274.awsdns-34.com.
hiper.dk. 4 NS ns-1732.awsdns-24.co.uk.
hiper.dk. 4 NS ns-1417.awsdns-49.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0