Apex domains cannot have CNAME records.
Question and response
Question
dig vodafone.nl. NS
Answer
vodafone.nl. 5 NS dnsit01.vodafone.nl.
vodafone.nl. 5 NS dnsit02.vodafone.nl.
Authority
The response has no authority records.
Additional
dnsit01.vodafone.nl. 5 A 62.140.138.237
dnsit02.vodafone.nl. 5 A 62.140.140.250
dnsit01.vodafone.nl. 5 AAAA 2a00:18c9:f001:1002:0:0:0:e
dnsit02.vodafone.nl. 5 AAAA 2a00:18c9:f001:1003:0:0:0:e
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0