Apex domains cannot have CNAME records.
Question and response
Question
dig xcelx.net. NS
Answer
xcelx.net. 4 NS ns-a.axcelx.net.
xcelx.net. 4 NS ns-b.axcelx.net.
Authority
The response has no authority records.
Additional
ns-a.axcelx.net. 4 A 192.34.85.189
ns-b.axcelx.net. 4 A 184.105.141.42
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0