Apex domains cannot have CNAME records.
Question and response
Question
dig fornex.org. NS
Answer
fornex.org. 5 NS ns1.fornex.com.
fornex.org. 5 NS ns3.fornex.com.
fornex.org. 5 NS ns2.fornex.com.
fornex.org. 5 NS ns4.fornex.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0