ipv6 global usable address

I know that the ipv6 global usable address is from 2000::/3 to E000::/3. But I have a hard time to figure out how many networks that is. Thx
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leblancAccountingAsked:
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Don JohnstonInstructorCommented:
I know that the ipv6 global usable address is from 2000::/3 to E000::/3.
Actually, the global address space is 2000::/3. The addresses above (4000::/3 - E000:/3) are reserved.

But I have a hard time to figure out how many networks that is.
Alot. :-)

As for how many "networks", it's hard to say because of the way the space is allocated to the TLAs, providers and sites. But if you assume a 64-bit network boundary, you would have 61-bits to work with. So call it around 2 quintillion.
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leblancAccountingAuthor Commented:
"The addresses above (4000::/3 - E000:/3) are reserved. " Where did you get this info? Thx
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