Apex domains cannot have CNAME records.
Question and response
Question
dig broadview.se. NS
Answer
broadview.se. 5 NS ns1.broadview.se.
broadview.se. 5 NS ns4.broadview.se.
broadview.se. 5 NS ns3.broadview.se.
broadview.se. 5 NS ns2.broadview.se.
Authority
The response has no authority records.
Additional
ns1.broadview.se. 5 A 82.99.18.111
ns2.broadview.se. 5 A 94.246.96.90
ns3.broadview.se. 5 A 62.109.34.75
ns4.broadview.se. 5 A 188.40.202.15
ns1.broadview.se. 5 AAAA 2a01:2b0:301d:99:0:0:0:111
ns2.broadview.se. 5 AAAA 2a01:2b0:301d:88:0:0:0:90
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0