Introduction to Address Translation
Back in the old days of the Internet, the TCP/IP address space defined by IP version 4 (IPv4, the version used today) was thought to be more than enough. Organizations could reserve their own address spaces through the Internet Assigned Numbers Authority (IANA), now called the Internet Corporation for Assigned Names and Numbers (ICANN), and anyone who wanted a block of IP addresses generally got them.
Since the early 1990s, various people have been predicting that the IPv4 address space will simply run out of available addresses. This is partially due to the explosive growth of the Internet, but it is also due to how the IPv4 address space is divided. Many organizations that were allocated address spaces early ...
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