Apex domains cannot have CNAME records.
Question and response
Question
dig adato.se. NS
Answer
adato.se. 4 NS nic2.miljodata.se.
adato.se. 4 NS uz5c15kc3lkws2mtwp7l8g9f33yffvvt96y54tlmn41zjy0043purm.pro.ns.buddyns.com.
adato.se. 4 NS uz56xw8h7fw656bpfv84pctjbl9rbzbqrw4rpzdhtvzyltpjdmx0zq.pro.ns.buddyns.com.
adato.se. 4 NS uz5x36jqv06q5yulzwcblfzcrk1b479xdttdm1nrgfglzs57bmctl8.pro.ns.buddyns.com.
Authority
The response has no authority records.
Additional
uz56xw8h7fw656bpfv84pctjbl9rbzbqrw4rpzdhtvzyltpjdmx0zq.pro.ns.buddyns.com. 4 A 37.143.61.179
uz56xw8h7fw656bpfv84pctjbl9rbzbqrw4rpzdhtvzyltpjdmx0zq.pro.ns.buddyns.com. 4 AAAA 2a01:a500:2766:0:0:0:5c3f:d10b
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0