(...) the internet went down across the country. A wave of cyberattacks left all systems on hold for more than seven days. First, the main national websites failed, from the official news site to the booking page of the national airline. Then, the Asian state’s connections with the rest of the world were interrupted. Emails could not be sent or received; there was no connection to cloud services. The blockade was complete.
Unless things have changed, North Korea doesn't have a whole lot by way of Internet. I think they used to have two Class C netblocks, 256 IP addresses each.
kagis.
They're apparently up to four.
https://en.wikipedia.org/wiki/Internet_in_North_Korea
The regime doesn't like people having access to outside information.