mx.cote-beton.com has no NS records.
NS records for this zone are defined at cote-beton.com.
NS records for this zone are defined at cote-beton.com.
Question and response
Question
dig mx.cote-beton.com. NS
Answer
The response has no answer records.
Authority
cote-beton.com. 3600 SOA dns.cote-beton.com. hostmaster.cote-beton.com. 1729105519 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0