<i>As I understand IPv4+ concept in this article, your router gets address 1.2.3.4 then every device behind it gets 1.2.3.4.0.0.0.1, etc.</i><p>This is the bit that wasn&#x27;t in djb&#x27;s original article AFAIR. My take was that 1.2.3.4 and 1.2.3.4.0.0.0.1 would be the same machine -- or at least allocated to the same entity.