[metrics-team] Please fact-check my guide to determining which website visitors use Tor

David Fifield david at bamsoftware.com
Wed Mar 23 19:24:26 UTC 2016


On Wed, Mar 23, 2016 at 06:52:38PM +0100, Karsten Loesing wrote:
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> Hi David,
> 
> On 23/03/16 16:52, David Fifield wrote:
> > This is some information Sadia Afroz and I are planning to send to 
> > Twitter, after our talk on Tor blocking today. Our goal is to show
> > how to measure how many users are on Tor, correctly. Would you
> > please check it for errors and suggest changes?
> 
> This all looks plausible!
> 
> What you might want to add is that people can get a quick first idea
> of IP addresses used by relays to register in the Tor network, IP
> addresses used for exiting to the internet, and exit policies by
> looking at Onionoo data:
> 
> https://onionoo.torproject.org/details?limit=500
> 
> https://onionoo.torproject.org/protocol.html
> 
> In particular the "or_addresses", "exit_addresses", and "exit_policy"
> fields seem relevant here.
> 
> Of course, people can as well process the raw data directly.  But
> maybe Onionoo data is sufficient for a first prototype.

Thanks, good suggestion. I didn't know that "exit_addresses" was in
Onionoo, that's great.


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