mail.goinet.net has no NS records.
NS records for this zone are defined at goinet.net.
NS records for this zone are defined at goinet.net.
Question and response
Question
dig mail.goinet.net. NS
Answer
The response has no answer records.
Authority
goinet.net. 7200 SOA ns1.ashcom.net. postmaster.ashcom.net. 2026012901 3600 1800 1800000 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0