Apex domains cannot have CNAME records.
Question and response
Question
dig rg.net. NS
Answer
rg.net. 5 NS nlns.globnix.net.
rg.net. 5 NS rip.psg.com.
rg.net. 5 NS ns1.rg.net.
Authority
The response has no authority records.
Additional
ns1.rg.net. 5 A 46.224.94.61
ns1.rg.net. 5 AAAA 2a01:4f8:1c1a:5360:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0