THE .net domain is the most popular on the internet, with more than 260m hosts counted by the most recent Internet Domain Survey. Hosts are separate computer “addresses” that are contacted when a website or domain name is called up. Japan's top-level domain .jp has the most hosts, counting over twice as many as Italy's. The biggest generic top-level domains are .edu, used by education institutions across the world, and .mil, which is used only by the American military. At the other end of the scale, only 47 hosts with the Afghanistan suffix .af were recorded, fewer than the Holy See's 67. Iraq and North Korea are even less popular, ranking joint 251st and 261st out of a possible 268 domains. And two went unused: .sj and .pm.