Apex domains cannot have CNAME records.
Question and response
Question
dig cygrids.com. NS
Answer
cygrids.com. 5 NS dns01.cygrids.net.
cygrids.com. 5 NS dns02.cygrids.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0