mx2.ornethd.net has no NS records.
NS records for this zone are defined at ornethd.net.
NS records for this zone are defined at ornethd.net.
Question and response
Question
dig mx2.ornethd.net. NS
Answer
The response has no answer records.
Authority
ornethd.net. 38400 SOA ns1.ornethd.net. admin.ornethd.net. 1433947188 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0