mx1.addonline.fr has no NS records.
NS records for this zone are defined at addonline.fr.
NS records for this zone are defined at addonline.fr.
Question and response
Question
dig mx1.addonline.fr. NS
Answer
The response has no answer records.
Authority
addonline.fr. 60 SOA ns1.add-online.com. hostmaster.addonline.fr. 2026022600 600 300 2419200 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0