centaurus.mithrandir.cz has no CNAME records.
Question and response
Question
dig centaurus.mithrandir.cz. NS
Answer
The response has no answer records.
Authority
mithrandir.cz. 3600 SOA ns.spoje.net. tech.spoje.net. 1772517617 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0