ns3.ptc.com.pl has no CNAME records.
Question and response
Question
dig ns3.ptc.com.pl. NS
Answer
The response has no answer records.
Authority
ptc.com.pl. 360 SOA ns3.ptc.com.pl. hostmaster.t-mobile.pl. 2025041000 3600 600 1209600 360
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0