Apex domains cannot have CNAME records.
Question and response
Question
dig saix.net. NS
Answer
saix.net. 3 NS sangoma.saix.net.
saix.net. 3 NS auth01.ns.uu.net.
saix.net. 3 NS sabela.saix.net.
saix.net. 3 NS igubu.saix.net.
saix.net. 3 NS ns2.telkom.co.za.
saix.net. 3 NS auth00.ns.uu.net.
saix.net. 3 NS induna.saix.net.
Authority
The response has no authority records.
Additional
igubu.saix.net. 3 A 196.25.1.1
auth00.ns.uu.net. 3 A 198.6.1.65
induna.saix.net. 3 A 196.43.1.14
sabela.saix.net. 3 A 196.43.1.9
sangoma.saix.net. 3 A 196.25.1.9
igubu.saix.net. 3 AAAA 2c0e:2001:4000:1:0:0:c419:101
induna.saix.net. 3 AAAA 2c0e:2001:0:1:0:0:c42b:10e
sabela.saix.net. 3 AAAA 2c0e:2001:0:1:0:0:c42b:109
sangoma.saix.net. 3 AAAA 2c0e:2001:4000:1:0:0:c419:109
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0