Apex domains cannot have CNAME records.
Question and response
Question
dig ncomputers.org. NS
Answer
ncomputers.org. 5 NS 1b.ncomputers.org.
ncomputers.org. 5 NS 1a.ncomputers.org.
ncomputers.org. 5 NS 1c.ncomputers.org.
Authority
The response has no authority records.
Additional
1a.ncomputers.org. 5 A 173.249.29.54
1b.ncomputers.org. 5 A 173.249.38.50
1c.ncomputers.org. 5 A 194.238.25.50
1a.ncomputers.org. 5 AAAA 2a02:c207:1:3253:1:0:0:1
1b.ncomputers.org. 5 AAAA 2a02:c207:1:3253:2:0:0:1
1c.ncomputers.org. 5 AAAA 2605:a140:1:4123:1:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0