smtp-out.dc2.nl.netcop.net has no NS records.
NS records for this zone are defined at netcop.net.
NS records for this zone are defined at netcop.net.
Question and response
Question
dig smtp-out.dc2.nl.netcop.net. NS
Answer
The response has no answer records.
Authority
netcop.net. 900 SOA ns1.netco.nl. hostmaster.netco.nl. 2026031901 21600 7200 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0