(The other, remote chance is the fact that the Internet was by choice taken down to prevent strike.) Internet access in North Korea is of course not prevalent on the finest of days: the state’s propaganda arm, as well as it is supposed to be simply accessible to the elite, the military. It is considered that, assuming North Korea was behind the Sony hacking that caused the enterprise Interview, it’d to do thus with help from China, perhaps even from the Chinese government’s own hacking facilities.
For comparison, the WiFi network of your house has its very own IP address; North Korea has 1,024 such addresses (although each address can serve millions of customers. My figure is . . . Millions of customers do not). That happens to be IP addresses get chopped up — each block of addresses is a power of two. It nearly looks like they are catching up!