When the Internet was first designed, it used “version 4” addresses. These are 32 bits, which means that we could have up to <a href="{ $sr }">4.2bn addresses</a>. This seemed like enough at the time, but is nowhere near enough in a world where the average U.S. household had <a href="{ $variety }">11 connected devices</a>.
在互联网最初设计时，使用的是“第四版”地址。它使用 32 位（4 字节）地址，意味着我们最多可以有 <a href="{ $sr }">42 亿个地址</a>。这在当时似乎足够了，但在一个平均美国家庭拥有 <a href="{ $variety }">11 台联网设备</a>的世界里，显然是不够的。