Apex domains cannot have CNAME records.
Question and response
Question
dig ip-5-196-149.eu. NS
Answer
ip-5-196-149.eu. 5 NS ns109.ovh.net.
ip-5-196-149.eu. 5 NS dns109.ovh.net.
Authority
The response has no authority records.
Additional
ns109.ovh.net. 5 A 5.135.67.9
dns109.ovh.net. 5 A 5.196.41.217
ns109.ovh.net. 5 AAAA 2001:41d0:b00:fd00:0:0:0:2
dns109.ovh.net. 5 AAAA 2001:41d0:d01:300:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0