spf.cnrs.fr has no NS records.
NS records for this zone are defined at cnrs.fr.
NS records for this zone are defined at cnrs.fr.
Question and response
Question
dig spf.cnrs.fr. NS
Answer
The response has no answer records.
Authority
cnrs.fr. 300 SOA ns0.cnrs.fr. dnsmaster.dsi.cnrs.fr. 2026031302 21600 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0