IANA 6to4 assignment status

Lars Prehn lprehn at mpi-inf.mpg.de
Mon Aug 2 15:12:28 UTC 2021

I see, thanks for the explanation.

One follow-up question: Why is the designation "6to4" rather than 
"IANA"? I would have expected the latter, as 2002::/16---similarly to 
the individual parts of 2001::/23---is listed under IANA's IPv6 
Special-Purpose Address Registry.

Thanks in advance,



On 02.08.21 16:56, Valdis Klētnieks wrote:
> On Mon, 02 Aug 2021 11:57:54 +0200, Lars Prehn said:
>> Is there a reason why the status of 2002::/16 in IANA's IPv6 unicast
>> assignments list [1] is ALLOCATED (with '6to4' as designation and the
>> note field indicating reservation) rather than RESERVED?
> It can probably be moved back to 'reserved' once we're *sure* that 6to4
> has finally been stamped out, never to return.  But I'm sure that *some*
> ISP or company out there is still using it as their main strategy for
> migrating to IPv6.

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