ns.grpleg.net has no NS records.
NS records for this zone are defined at grpleg.net.
NS records for this zone are defined at grpleg.net.
Question and response
Question
dig ns.grpleg.net. NS
Answer
The response has no answer records.
Authority
grpleg.net. 900 SOA lim.legrand.tm.fr. hostmaster.grpleg.net. 2016050654 86400 7200 3600000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0