Jon Postel

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Here is an idea for allocating the provider based IPv6 addresses
(there will also be other allocation schemes).

Generally speaking the layout is as follows:

+--------+--------+--------+--------+--------+--------+--------+--------+
|01000000|        |        |        |00000000|00000000|        |        |
+--------+--------+--------+--------+--------+--------+--------+--------+

|Provider|Registry|--Provider Id----|------Zero-------|--Subscriber Id--|
| Code   |   Id   |


+--------+--------+--------+--------+--------+--------+--------+--------+
|00000000|        |        |        |        |        |        |        |
+--------+--------+--------+--------+--------+--------+--------+--------+

|--Zero--|-Subnet-|------------------MAC Address------------------------|


Registry Id  Registry   Provider    Notes
                        Id Octets
-----------  --------   ----------  -------------------
     TBD     reserved      2        not currently used
     TBD     InterNIC      2        as operated by Network Solutions
     TBD     Europe        2        as operated by RIPE NCC
     TBD     AP NIC        2        as operated by ???
     TBD     AS Number     2        Provider Id is Autonomous System Number 
     TBD     Ether Block   3        Provider Id is Ethernet Vendor Code

The last two registries are essentially automatic allocations of IPv6 addresses
to entities that have already registered in either (or both) of the global
address spaces of Autonomous System Numbers or Ethernet Vendor Codes.

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