rs1.dnsnode.net has no CNAME records.
Question and response
Question
dig rs1.dnsnode.net. NS
Answer
The response has no answer records.
Authority
dnsnode.net. 1898 SOA nna.netnod.se. noc.netnod.se. 1771459243 7200 1800 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0