We have removed the NS records from SURBL zone files. They're not needed on public nameservers since authority is delegated from the parent zone, and they're not needed on private nameservers since they would delegate authority back to the public servers. If needed you can add NS records appropriate to your local nameservers on your local copies of the zone, but again this should be unnecessary. The public nameserver NS records are available separately in the rsync directory as: ns.rbldnsd. Again these should not be needed by anyone.

If you had local grep or sed filter expressions to remove the NS records from the zones for your local use, then they should no longer be needed.