mail1.bgl.lu has no NS records.
NS records for this zone are defined at bgl.lu.
NS records for this zone are defined at bgl.lu.
Question and response
Question
dig mail1.bgl.lu. NS
Answer
The response has no answer records.
Authority
bgl.lu. 600 SOA ns1.bnpparibas.com. i_names.bnpparibas.com. 345 14400 3600 2419200 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0