最常用的是一个叫做NAT64的网络地址转换技术，它工作在可以连接到服务提供者网络的装置上。

The most common one is a network address translation technique called NAT64, which can run on an appliance attached to a service provider's network.

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同样的，这种装置也可以使不同类型IP地址的人们互发电子邮件。

Similarly, that appliance could allow users with different types of IP addresses to send E-mail to each other.

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IPv4协议用的是32位编码的地址，可以支持大约43亿个装置或设备（的地址）。

IPv4 uses 32-bit addresses and can support approximately 4.3 billion devices.

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