At 09:50 a.m. 24/03/2014, you wrote:

2 votes for maxmind. (or bgp feed with communities or something from your ISP) it depends if you are trying to firewall for cost reasons, eg: I don't want to serve my HD content to international viewers because it will bankrupt me. Or I don't want to serve my international content to international viewers because it would breach a license agreement with the rights holder.

The tier-1 CDNs all offer more than enough filtering to do very decent geo-fencing. So its not hard to limit to "NZ-only" or "everywhere but not nz". Sometimes we use that as the second line of defence. Rights agreements often require 2 levels or more.