docker.iptv.k.pl has no CNAME records.
Question and response
Question
dig docker.iptv.k.pl. NS
Answer
The response has no answer records.
Authority
iptv.k.pl. 447 SOA dns.korbank.pl. hostmaster.korbank.com. 2025072308 43200 4320 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0