server.tyhan.cz has no CNAME records.
Question and response
Question
dig server.tyhan.cz. NS
Answer
The response has no answer records.
Authority
tyhan.cz. 3293 SOA ns1.ignum.com. hostmaster.ignum.cz. 2026021801 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0