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        <li class="active">Sources</li>
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      <h1>Sources <a href="#sources" name="sources" class="anchor">#</a></h1>
      <p>You're a data person and only trust the statistics that you doctored yourself?  Here's all the data right from the source, doctor.</p>
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      <h2>Main sources <a href="#main" name="main" class="anchor">#</a></h2>
      <p>We get most of our data from the services below.</p>
      <ul>
        <li><a href="collector.html">CollecTor</a> collects and archives data from various nodes and services in the public Tor network.</li>
        <li><a href="stats.html">Statistics</a> used for visualizations on this site are available in the CSV format.</li>
        <li><a href="onionoo.html">Onionoo</a> provides current and historical data about relays and bridges via a web-based API.</li>
        <li><a href="reproducible-metrics.html">Reproducible Metrics</a> specifies how to reproduce the data behind the graphs on this site.</li>
      </ul>
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      <h2>Other sources <a href="#other" name="other" class="anchor">#</a></h2>
      <p>The following tools perform active measurements in the Tor network or provide other Tor network data.</p>
      <ul>
        <li><a href="https://gitweb.torproject.org/user/phw/exitmap.git" target="_blank">Exitmap</a> is a fast and extensible scanner for Tor exit relays.</li>
        <li><a href="https://www.torproject.org/projects/tordnsel.html.en" target="_blank">TorDNSEL</a> publishes lists of IP addresses of multi-homed Tor exits.</li>
        <li><a href="https://gitlab.torproject.org/tpo/metrics/onionperf" target="_blank">OnionPerf</a> measures Tor performance with a set of utilities and Python scripts.</li>
        <li><a href="https://ooni.torproject.org/" target="_blank">OONI</a> detects censorship, surveillance, and traffic manipulation on the internet.</li>
        <li><a href="https://gitweb.torproject.org/user/phw/sybilhunter.git/" target="_blank">Sybilhunter</a> attempts to detect Sybil attacks on the Tor network.</li>
      </ul>
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	<div class="container">
	  <h2>New sources <a href="#new" name="new" class="anchor">#</a></h2>
	  <p>We have written <a href="/metrics-guidelines.html">guidelines for Tor developers</a> that would like metrics collected by their service to be integrated
	  with Tor Metrics.</p>
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      <h2>Specifications <a href="#specifications" name="specifications" class="anchor">#</a></h2>
      <p>The following specification documents are available for Tor network data.</p>
      <ul>
        <li><a href="https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt" target="_blank">Tor directory protocol, version 3</a></li>
        <li><a href="https://gitweb.torproject.org/torspec.git/tree/attic/dir-spec-v2.txt" target="_blank">Tor directory protocol, version 2</a></li>
        <li><a href="https://gitweb.torproject.org/torspec.git/tree/attic/dir-spec-v1.txt" target="_blank">Tor directory protocol, version 1</a></li>
        <li><a href="bridge-descriptors.html">Tor bridge descriptors</a></li>
        <li><a href="web-server-logs.html">Tor web server logs</a></li>
      </ul>
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