mx2.bouygues-telecom.fr has no NS records.
NS records for this zone are defined at bouygues-telecom.fr.
NS records for this zone are defined at bouygues-telecom.fr.
Question and response
Question
dig mx2.bouygues-telecom.fr. NS
Answer
The response has no answer records.
Authority
bouygues-telecom.fr. 900 SOA primary.localdomain. dnsextmaster.bouyguestelecom.fr. 788 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0