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That depends, the user / organization might get:
- only one IPv6 address (/128 prefix)
- 1.84 x 10^19 of IP addresses (/64 prefix) this is actually recommended by rfc6177
- /56 prefix, which is more that you can imagine
- /48 prefix, which is even more than that...
Unless you know what kind of prefix user has there's no way to tell if a IPV6 address belongs to this user.
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