mt.hexaoperator.com has no NS records.
NS records for this zone are defined at hexaoperator.com.
NS records for this zone are defined at hexaoperator.com.
Question and response
Question
dig mt.hexaoperator.com. NS
Answer
The response has no answer records.
Authority
hexaoperator.com. 3600 SOA dns.home.pl. admin.home.pl. 1583999709 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0