Apex domains cannot have CNAME records.
Question and response
Question
dig saprotan-utama.com. NS
Answer
saprotan-utama.com. 4 NS saprotanvm.as45302.net.
saprotan-utama.com. 4 NS ns1.as45302.net.
saprotan-utama.com. 4 NS ns3.desnet.id.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0