Apex domains cannot have CNAME records.
Question and response
Question
dig toplumtv.net. NS
Answer
toplumtv.net. 5 NS ns-876.awsdns-45.net.
toplumtv.net. 5 NS ns-153.awsdns-19.com.
toplumtv.net. 5 NS ns-1584.awsdns-06.co.uk.
toplumtv.net. 5 NS ns-1110.awsdns-10.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0