Seeing as North Korea only have 3 allocated address blocks, 175.45.176.0/22, 210.52.109.0/24 and 77.94.35.0/24 they only have approx. 1530 globally reachable IP addresses. However, North Korea must have more than ~1530 hosts. Does this mean that they use some kind of NAT, or is their number of internet connected hosts just that small?

Is there any information about the intranet in North Korea? Do they have a private class A network that everyone in the country is connected to with their own DNS servers, routers, etc which are unreachable from the rest of the internet?