foobar.grin.hu has no NS records.
NS records for this zone are defined at grin.hu.
NS records for this zone are defined at grin.hu.
Question and response
Question
dig foobar.grin.hu. NS
Answer
The response has no answer records.
Authority
grin.hu. 120 SOA ns0.grin.hu. grin.grin.hu. 1588970207 28800 7200 604800 120
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0