Apex domains cannot have CNAME records.
Question and response
Question
dig han.han-solo.net. NS
Answer
han.han-solo.net. 5 NS han.han-solo.net.
han.han-solo.net. 5 NS leia.han-solo.net.
Authority
The response has no authority records.
Additional
han.han-solo.net. 5 A 85.214.23.198
leia.han-solo.net. 5 A 83.138.64.9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0