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What are "Unicast identity tokens"?

Last updated on December 26, 2018

        I was reading an introduction to IPv6 which talks about the depletion of IPv4 addresses.
I came across the following line:
As noted in RFC 5735 a number of address blocks are reserved for users outside 'conventional' use in the public Internet as unicast identity tokens.
What are "Unicast Identity Tokens"? Googling it up didn't yield much results. Also the same introduction shows the following figure shortly after: IPv4 address distribution What is the gray "Multicast" group? Is it related to the previous point?

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