Apex domains cannot have CNAME records.
Question and response
Question
dig karakum.biz. NS
Answer
karakum.biz. 5 NS scalahosting.earth.orderbox-dns.com.
karakum.biz. 5 NS scalahosting.mercury.orderbox-dns.com.
karakum.biz. 5 NS scalahosting.mars.orderbox-dns.com.
karakum.biz. 5 NS scalahosting.venus.orderbox-dns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0