Apex domains cannot have CNAME records.
Question and response
Question
dig snap.net.nz. NS
Answer
snap.net.nz. 4 NS ns1.snap.net.nz.
snap.net.nz. 4 NS ns2.snap.net.nz.
Authority
The response has no authority records.
Additional
ns1.snap.net.nz. 4 A 202.37.101.1
ns2.snap.net.nz. 4 A 202.37.101.2
ns1.snap.net.nz. 4 AAAA 2406:e000:0:0:0:0:0:100
ns2.snap.net.nz. 4 AAAA 2406:e000:0:0:0:0:0:200
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0