imap4.c2.hu has no NS records.
NS records for this zone are defined at c2.hu.
NS records for this zone are defined at c2.hu.
Question and response
Question
dig imap4.c2.hu. NS
Answer
The response has no answer records.
Authority
c2.hu. 300 SOA ns1.hmx.hu. dnsadmin.mail.hmx.hu. 2019090634 86400 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0