Apex domains cannot have CNAME records.
Question and response
Question
dig rv.uar.net. NS
Answer
rv.uar.net. 4 NS zeta.uar.net.
rv.uar.net. 4 NS kappa.uar.net.
rv.uar.net. 4 NS theta.uar.net.
rv.uar.net. 4 NS iota.uar.net.
rv.uar.net. 4 NS eta.uar.net.
Authority
The response has no authority records.
Additional
eta.uar.net. 4 A 194.44.245.234
iota.uar.net. 4 A 95.216.126.26
zeta.uar.net. 4 A 194.44.147.51
kappa.uar.net. 4 A 194.44.10.3
theta.uar.net. 4 A 194.44.214.213
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0