If you want to use Openprovider as slave nameserver, your own master nameserver should meet the following requirements:
- The domain has been configured in your master nameserver
- The DNS zone of your master nameserver should contain the NS record ns1.openprovider.nl
If not all these requirements are met, Openprovider will not be able to run as a slave nameserver. As a result, domain registries might reject your registrations.