rontok.pil.dk has no CNAME records.
Question and response
Question
dig rontok.pil.dk. NS
Answer
The response has no answer records.
Authority
pil.dk. 461 SOA ns1.dlx.dk. hostmaster.pil.dk. 2026030501 14400 7200 2415600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0