Apex domains cannot have CNAME records.
Question and response
Question
dig allweb.se. NS
Answer
allweb.se. 5 NS ns2.allweb.se.
allweb.se. 5 NS ns1.allweb.se.
Authority
The response has no authority records.
Additional
ns1.allweb.se. 5 A 94.103.199.147
ns2.allweb.se. 5 A 194.153.91.130
ns1.allweb.se. 5 AAAA 2a01:8e00:4:0:0:0:0:2
ns2.allweb.se. 5 AAAA 2a01:8e00:4:0:0:0:0:50
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0