Apex domains cannot have CNAME records.
Question and response
Question
dig ntp.dev. NS
Answer
ntp.dev. 5 NS d.ns.bitnames.com.
ntp.dev. 5 NS c.ns.bitnames.com.
ntp.dev. 5 NS a.ns.bitnames.com.
ntp.dev. 5 NS b.ns.bitnames.com.
Authority
The response has no authority records.
Additional
c.ns.bitnames.com. 5 A 68.183.187.150
c.ns.bitnames.com. 5 AAAA 2400:6180:0:d0:0:0:16e6:2001
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0