mx2.atos.net has no NS records.
NS records for this zone are defined at atos.net.
NS records for this zone are defined at atos.net.
Question and response
Question
dig mx2.atos.net. NS
Answer
The response has no answer records.
Authority
atos.net. 900 SOA ns1.atos-services.net. ipam.atos.net. 2021122891 900 600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0