Apex domains cannot have CNAME records.
Question and response
Question
dig onr.com. NS
Answer
onr.com. 5 NS ns1.onr.com.
onr.com. 5 NS ns2.onr.com.
Authority
The response has no authority records.
Additional
ns1.onr.com. 5 A 207.200.0.230
ns2.onr.com. 5 A 207.200.0.25
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0