mx.tophiking.net has no NS records.
NS records for this zone are defined at tophiking.net.
NS records for this zone are defined at tophiking.net.
Question and response
Question
dig mx.tophiking.net. NS
Answer
The response has no answer records.
Authority
tophiking.net. 3600 SOA dns.tophiking.net. hostmaster.tophiking.net. 1338167331 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0