b.mx.apm-internet.net has no NS records.
NS records for this zone are defined at mx.apm-internet.net.
NS records for this zone are defined at mx.apm-internet.net.
Question and response
Question
dig b.mx.apm-internet.net. NS
Answer
The response has no answer records.
Authority
mx.apm-internet.net. 3600 SOA dns0.apm-internet.net. support.apm-internet.net. 2025092801 10800 7200 86400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0