[nznog] List of NZ IP addresses?

Hi all. I realise that it's a constantly changing list but does anyone have a list on NZ IPs? Why: We're trying to set up a website to be accessible in NZ only. Knowing what I know then firewalling is the tool (a man with a hammer...) but I need to routinely source a more recent list. Any suggestions or hints appreciated. Cheers... Clark