mx.fastfone.org has no NS records.
NS records for this zone are defined at fastfone.org.
NS records for this zone are defined at fastfone.org.
Question and response
Question
dig mx.fastfone.org. NS
Answer
The response has no answer records.
Authority
fastfone.org. 300 SOA dns100.ovh.net. tech.ovh.net. 2026031003 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0