Apex domains cannot have CNAME records.
Question and response
Question
dig nines.nl. NS
Answer
nines.nl. 5 NS ns1.nines.nl.
nines.nl. 5 NS ns2.nines.nl.
nines.nl. 5 NS ns3.9-9-9-9-9.net.
Authority
The response has no authority records.
Additional
ns1.nines.nl. 5 A 162.251.34.5
ns2.nines.nl. 5 A 185.77.120.5
ns1.nines.nl. 5 AAAA 2a03:5500:851:0:0:0:0:5
ns2.nines.nl. 5 AAAA 2a03:5500:850:0:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0