Apex domains cannot have CNAME records.
Question and response
Question
dig zoominternet.net. NS
Answer
zoominternet.net. 5 NS ns1.zbzoom.net.
zoominternet.net. 5 NS ns2.zbzoom.net.
Authority
The response has no authority records.
Additional
ns1.zbzoom.net. 5 A 24.154.1.4
ns2.zbzoom.net. 5 A 24.154.1.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0