Originally published on addrex.net.

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With one more month of 2020 ahead of us, we have already witnessed a highly active IPv4 transfers market this year. According to the transfer logs (raw data) available from the Regional Internet Registries (RIRs), over 40 million numbers have been transferred since January 1, 2020. About 20 million additional numbers have been updated due to company mergers and acquisitions.

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2019 & IPv4 Transfers as of November 17, 2020

Originally published on Addrex.net.

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Photo by Taylor Vick on Unsplash

An IP number block is a group of IP numbers that have not yet been assigned to specific devices on a network; once assigned and in use, IP numbers technically become IP addresses, although many people refer to IP numbers and IP addresses interchangeably.

In the beginning, the United States government and its contractors assigned IP number blocks by class, as follows:

An table show for each class, the corresponding CIDR, beginning & ending address, and purpose.
An table show for each class, the corresponding CIDR, beginning & ending address, and purpose.

This method had inefficiencies that exhausted the availability of IPv4 numbers faster than necessary. For example, when a small organization required addresses for 255 devices, a class C number block would not be sufficient so they would obtain a class B block and not use over 65,000 of the available IP numbers in the block. With only a finite total of IPv4 numbers available (232 or about 4.29 billion), in the late 1980s and early 1990s when personal computing exploded in popularity and the World Wide Web (WWW) was invented, it quickly became apparent that this inefficient method of assigning blocks would exhaust the number of available blocks quickly. …

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