Apex domains cannot have CNAME records.
Question and response
Question
dig dyna-ns.net. NS
Answer
dyna-ns.net. 5 NS ns1.dyna-ns.net.
dyna-ns.net. 5 NS ns2.dyna-ns.net.
Authority
The response has no authority records.
Additional
ns1.dyna-ns.net. 5 A 162.159.26.92
ns1.dyna-ns.net. 5 A 162.159.27.158
ns2.dyna-ns.net. 5 A 162.159.24.5
ns2.dyna-ns.net. 5 A 162.159.25.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0