Wow. Where to start with this post.
Maybe I don't understand how the internet work. so like, one router in North Korea handles all the connections? I guess other countries have more routers to connect to other countries?
North Korea does not just have 1 router. And most countries do not have 'more' routers. Countries have tens of thousands to hundreds of thousands of routers.
192.168.0.0/16 and 10.0.0.0/8 are private IP addresses. You can use the same private range as your neighbour and their neighbours neighbour.
As others have noted, North Korea probably has lots of small networks with a government mandated router listening on 10.76.1.11 on each one of those networks.
I don't see many articles and personal blogs from the people of North Korea. Maybe only the wealthy people can afford internet access?
Because nobody in North Korea posts articles or blogs. (I'd love to see one if there was.) The common North Korean citizen does not get internet access. If you're lucky enough to get internet access (you're of some high status) it is only the internal internet (or North Korean Intranet) not the outside internet. Only the supreme ruling elite get access to the outside Internet.
That is why you won't find articles or blog posts from people from within North Korea....