Apex domains cannot have CNAME records.
Question and response
Question
dig led.gblnet.net. NS
Answer
led.gblnet.net. 5 NS ns2.gblnet.ru.
led.gblnet.net. 5 NS ns.gblnet.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0