sirius.pd.uniza.sk has no NS records.
NS records for this zone are defined at pd.uniza.sk.
NS records for this zone are defined at pd.uniza.sk.
Question and response
Question
dig sirius.pd.uniza.sk. NS
Answer
The response has no answer records.
Authority
pd.uniza.sk. 86400 SOA ns1.pd.uniza.sk. karpis.pd.uniza.sk. 2018062801 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0