Apex domains cannot have CNAME records.
Question and response
Question
dig iperweb.com. NS
Answer
iperweb.com. 3 NS ns2.prometeus.net.
iperweb.com. 3 NS ns1.prometeus.net.
Authority
The response has no authority records.
Additional
ns1.prometeus.net. 3 A 37.187.16.10
ns1.prometeus.net. 3 A 195.88.4.254
ns2.prometeus.net. 3 A 185.136.176.112
ns2.prometeus.net. 3 A 195.88.4.253
ns1.prometeus.net. 3 AAAA 2001:41d0:a:100a:0:0:0:1
ns1.prometeus.net. 3 AAAA 2a00:dcc0:eda:2:195:88:5:d1
ns2.prometeus.net. 3 AAAA 2a00:dcc0:eda:2:195:88:5:d2
ns2.prometeus.net. 3 AAAA 2a00:dcc7:d3ff:0:185:136:176:112
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0