lms.artus.net.pl has no CNAME records.
Question and response
Question
dig lms.artus.net.pl. NS
Answer
The response has no answer records.
Authority
artus.net.pl. 1024 SOA ns1.artus.net.pl. admin.artus.net.pl. 2025120500 28800 14400 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0