Apex domains cannot have CNAME records.
Question and response
Question
dig ipnext.it. NS
Answer
ipnext.it. 1 NS wheelchair.ipnext.it.
ipnext.it. 1 NS dns3.ipnext.it.
ipnext.it. 1 NS icaro.ipnext.it.
Authority
The response has no authority records.
Additional
dns3.ipnext.it. 1 A 52.215.178.83
icaro.ipnext.it. 1 A 212.45.136.14
wheelchair.ipnext.it. 1 A 212.121.64.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0