node-net.dragon.cz has no CNAME records.
Question and response
Question
dig node-net.dragon.cz. NS
Answer
The response has no answer records.
Authority
dragon.cz. 5176 SOA ns.dragon.cz. hostmaster.dragon.cz. 2026021900 7200 3600 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0