mx.concertaerials.com has no NS records.
NS records for this zone are defined at concertaerials.com.
NS records for this zone are defined at concertaerials.com.
Question and response
Question
dig mx.concertaerials.com. NS
Answer
The response has no answer records.
Authority
concertaerials.com. 3600 SOA dns.concertaerials.com. hostmaster.concertaerials.com. 1783494927 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0