mx.sys.sulinet.hu has no NS records.
NS records for this zone are defined at sys.sulinet.hu.
NS records for this zone are defined at sys.sulinet.hu.
Question and response
Question
dig mx.sys.sulinet.hu. NS
Answer
The response has no answer records.
Authority
sys.sulinet.hu. 86400 SOA ns2.iif.hu. hostmaster.iif.hu. 2026021901 43200 14400 2592000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0