Apex domains cannot have CNAME records.
Question and response
Question
dig balt.net. NS
Answer
balt.net. 4 NS dns2.balt.net.
balt.net. 4 NS dns3.balt.net.
balt.net. 4 NS dns4.balt.net.
balt.net. 4 NS dns1.balt.net.
Authority
The response has no authority records.
Additional
dns1.balt.net. 4 A 92.62.130.14
dns2.balt.net. 4 A 92.62.130.15
dns3.balt.net. 4 A 45.82.34.23
dns4.balt.net. 4 A 217.117.28.250
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0