Does anyone have a sample User Agent? I'd be very curious if anyone has tried doing some regex's on some request logs to see if they got any page hits from North Korea :)
There are the IP's from North Korea available as well, it was discussed couple of time ago on HN[0]. I think checking by IP is more reliable than checking the browser: Red Star OS is not the only OS in North Korea and someone could use Naenara Browser from the outside as well...