bb.eunet.cz has no NS records.
NS records for this zone are defined at eunet.cz.
NS records for this zone are defined at eunet.cz.
Question and response
Question
dig bb.eunet.cz. NS
Answer
The response has no answer records.
Authority
eunet.cz. 86400 SOA ns1.gts.cz. hostmaster.cz.net. 2017021403 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0