mx.tv4stream.info has no NS records.
NS records for this zone are defined at tv4stream.info.
NS records for this zone are defined at tv4stream.info.
Question and response
Question
dig mx.tv4stream.info. NS
Answer
The response has no answer records.
Authority
tv4stream.info. 3600 SOA dns.tv4stream.info. hostmaster.tv4stream.info. 1676233495 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0