Apex domains cannot have CNAME records.
Question and response
Question
dig bluecatdns.com. NS
Answer
bluecatdns.com. 5 NS ns26.domaincontrol.com.
bluecatdns.com. 5 NS ns25.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0