ha1.eri.cz has no NS records.
NS records for this zone are defined at eri.cz.
NS records for this zone are defined at eri.cz.
Question and response
Question
dig ha1.eri.cz. NS
Answer
The response has no answer records.
Authority
eri.cz. 2560 SOA ns1.websupport.cz. admin.websupport.cz. 1756122190 7200 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0