Re: [tor-relays] pinning relay keys to IPs (or not)

[starlight.2015q2@xxxxxxxxxxx]

At 22:05 7/28/2015 -0400, you wrote:
>
>A couple of minor notes regarding ASNs:
>

Also the AS number assigned to an IP
address may legitimately vary depending
on the source/observer.  This is due to
the relativistic nature of BGP routing.
For example a Comcast address 74.95.187.105
is listed in AS 33287 by CYMRU (my preferred
source), but Routeviews does not see
the sub-block due to BGP aggregation
and puts it in 7922.

Looking-glass servers are helpful when
trying to understand AS-IP assignments,
here are just two of many

   http://lg.he.net
   http://lookingglass.level3.net/

=====

Much of the above applies equally
to IPv6 except that by design, the
IPv6 address space is far less fragmented
and very often an AS will advertise only
one and never more than a handful of
address blocks.

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