Apex domains cannot have CNAME records.
Question and response
Question
dig gateworks.nl. NS
Answer
gateworks.nl. 5 NS ns1.gateworks.nl.
gateworks.nl. 5 NS ns2.gateworks.nl.
Authority
The response has no authority records.
Additional
ns1.gateworks.nl. 5 A 188.40.69.148
ns2.gateworks.nl. 5 A 88.198.137.157
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0