spf.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 spf.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