ns.profik.net has no CNAME records.
Question and response
Question
dig ns.profik.net. NS
Answer
The response has no answer records.
Authority
profik.net. 3600 SOA ns.profik.cz. hostmaster.itprofik.cz. 2008120183 7200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0