ns2.di-net.pl has no CNAME records.
Question and response
Question
dig ns2.di-net.pl. NS
Answer
The response has no answer records.
Authority
di-net.pl. 312 SOA ns1.di-net.pl. hostmaster.di-net.pl. 2026020500 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0