dns1.openip.fr has no NS records.
NS records for this zone are defined at openip.fr.
NS records for this zone are defined at openip.fr.
Question and response
Question
dig dns1.openip.fr. NS
Answer
The response has no answer records.
Authority
openip.fr. 10800 SOA dns1.openip.fr. root.openip.fr. 2026020401 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0