Apex domains cannot have CNAME records.
Question and response
Question
dig iag.eu. NS
Answer
iag.eu. 4 NS d.inet.ns01.eu.
iag.eu. 4 NS c.inet.ns01.eu.
iag.eu. 4 NS a.inet.ns01.eu.
iag.eu. 4 NS b.inet.ns01.eu.
Authority
The response has no authority records.
Additional
a.inet.ns01.eu. 5 A 217.160.80.161
b.inet.ns01.eu. 5 A 217.160.81.161
c.inet.ns01.eu. 5 A 185.132.35.161
d.inet.ns01.eu. 5 A 185.132.34.161
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0