Apex domains cannot have CNAME records.
Question and response
Question
dig ke71.network. NS
Answer
ke71.network. 4 NS k1.ns.ke71.network.
ke71.network. 4 NS k2.ns.ke71.network.
ke71.network. 4 NS k3.ns.ke71.network.
Authority
The response has no authority records.
Additional
k1.ns.ke71.network. 4 A 162.55.179.86
k2.ns.ke71.network. 4 A 95.216.154.64
k3.ns.ke71.network. 4 A 194.48.168.5
k1.ns.ke71.network. 4 AAAA 2a01:4f8:1c1c:62f9:162:55:179:86
k2.ns.ke71.network. 4 AAAA 2a01:4f9:c010:65:0:0:0:64
k3.ns.ke71.network. 4 AAAA 2a0a:51c0:0:12a:194:48:168:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0