f-dns.pl has no CNAME records.
Question and response
Question
dig f-dns.pl. NS
Answer
The response has no answer records.
Authority
pl. 3600 SOA a-dns.pl. dnsmaster.nask.pl. 1772183403 900 300 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0