ns2.avitointernet.pl has no CNAME records.
Question and response
Question
dig ns2.avitointernet.pl. NS
Answer
The response has no answer records.
Authority
avitointernet.pl. 4943 SOA ns1.avitointernet.pl. noc.intertor.net. 1980010153 14400 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0