Apex domains cannot have CNAME records.
Question and response
Question
dig mrgreg.org. NS
Answer
mrgreg.org. 5 NS ns1.mrgreg.org.
mrgreg.org. 5 NS ns2.mrgreg.org.
Authority
The response has no authority records.
Additional
ns1.mrgreg.org. 5 A 62.204.35.41
ns2.mrgreg.org. 5 A 45.66.248.44
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0