Apex domains cannot have CNAME records.
Question and response
Question
dig omni-speed.com. NS
Answer
omni-speed.com. 5 NS ns-864.awsdns-44.net.
omni-speed.com. 5 NS ns-1092.awsdns-08.org.
omni-speed.com. 5 NS ns-1821.awsdns-35.co.uk.
omni-speed.com. 5 NS ns-132.awsdns-16.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0