IPv6 prefix from T-Mobile USA used but not announced in BGP (2607:7700::/32)

Ca By cb.list6 at gmail.com
Wed Apr 27 20:58:39 UTC 2016

On Wednesday, April 27, 2016, Aaron Hopkins <lists at die.net> wrote:

> On Wed, 27 Apr 2016, Baptiste Jonglez wrote:
> While doing statistics on the participants of a public DHT, I was
>> surprised to see some IP addresses that are not present in the DFZ:
> I believe those are used by T-mobile's 464XLAT (RFC 6877) implementation.
> Recent Android on T-mobile is IPv6-only and has no ability to connect to
> raw IPv4 addresses.  T-mobile's DNS servers are only asked by these devices
> to translate hostnames to IPv6 addresses.  If they can't find an IPv6
> address, they will look up the IPv4 address for a hostname, and pack it
> into
> the bottom 32 bits of an IPv6 address that routes to a IPv6-to-IPv4 NAT
> device.
> 2607:7700:0:25::4e00:605b
> 4e00:605b ->
>                                     -- Aaron

Apple has also required the ability for ipv6-only operations


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