Apex domains cannot have CNAME records.
Question and response
Question
dig platen.se. NS
Answer
platen.se. 3 NS ns2.dnsdrift.net.
platen.se. 3 NS ns.dnsdrift.net.
Authority
The response has no authority records.
Additional
ns.dnsdrift.net. 3 A 193.254.192.2
ns2.dnsdrift.net. 3 A 193.41.118.211
ns.dnsdrift.net. 3 AAAA 2a02:5120:ffff:2017:0:0:0:2
ns2.dnsdrift.net. 3 AAAA 2a02:5120:ffff:2004:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0