lb1.artefact.fr has no NS records.
NS records for this zone are defined at artefact.fr.
NS records for this zone are defined at artefact.fr.
Question and response
Question
dig lb1.artefact.fr. NS
Answer
The response has no answer records.
Authority
artefact.fr. 3600 SOA nsa.bookmyname.com. 8751e8ad1d405ea0\.t1434589.whois.bookmyname.com. 1772529133 43200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0