smtp00.tps.sfr.net has no NS records.
NS records for this zone are defined at tps.sfr.net.
NS records for this zone are defined at tps.sfr.net.
Question and response
Question
dig pftps-smtp00-cbv4-pr.tps.sfr.net. NS
Answer
The response has no answer records.
Authority
tps.sfr.net. 86400 SOA nspriprov.dns.sfr.net. support.dns.sfr.net. 2016122000 10800 3600 1814400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0