Apex domains cannot have CNAME records.
Question and response
Question
dig ird.nc. NS
Answer
ird.nc. 4 NS ns1.ird.nc.
ird.nc. 4 NS ns0.ird.nc.
Authority
The response has no authority records.
Additional
ns0.ird.nc. 4 A 193.51.249.38
ns1.ird.nc. 4 A 193.51.249.42
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0