mx.piroediciones.com has no NS records.
NS records for this zone are defined at piroediciones.com.
NS records for this zone are defined at piroediciones.com.
Question and response
Question
dig mx.piroediciones.com. NS
Answer
The response has no answer records.
Authority
piroediciones.com. 3600 SOA dns.piroediciones.com. hostmaster.piroediciones.com. 1932751165 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0