smtpout02.voo.be has no NS records.
NS records for this zone are defined at voo.be.
NS records for this zone are defined at voo.be.
Question and response
Question
dig smtpout02.voo.be. NS
Answer
The response has no answer records.
Authority
voo.be. 2560 SOA brutele01.brutele.be. hostmaster.voo.be. 2026030500 16384 900 1048576 2560
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0