Apex domains cannot have CNAME records.
Question and response
Question
dig rasp.sh. NS
Answer
rasp.sh. 4 NS ns2.rasp.sh.
rasp.sh. 4 NS ns1.rasp.sh.
Authority
The response has no authority records.
Additional
ns1.rasp.sh. 4 A 223.130.25.243
ns2.rasp.sh. 4 A 103.11.206.66
ns1.rasp.sh. 4 AAAA 2400:b800:0:562:0:0:0:53
ns2.rasp.sh. 4 AAAA 2400:b800:1:100:0:0:4240:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0