Apex domains cannot have CNAME records.
Question and response
Question
dig ERIOMEM.NET. NS
Answer
eriomem.net. 5 NS ns1.eriomem.net.
eriomem.net. 5 NS ns1.eu.org.
Authority
The response has no authority records.
Additional
ns1.eu.org. 5 A 45.63.100.187
ns1.eriomem.net. 5 A 136.244.111.41
ns1.eu.org. 5 AAAA 2001:19f0:7402:6b6:5400:1ff:fe9e:d9fe
ns1.eriomem.net. 5 AAAA 2a05:f480:1400:2c3f:5400:4ff:fef4:e48
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0