p>A tracker with the protocol &quot;udp://&quot; in its URI
is supposed to be contacted using this protocol.</p>
<p>This protocol is supported by
<a class="reference external" href="http://xbtt.sourceforge.net">xbt-tracker</a>.</p>
<p>For additional information and descriptions of
the terminology used in this document, see
the <a class="reference external" href="http://wiki.theory.org/index.php/BitTorrentSpecification">protocol specification</a></p>
<p>All values are sent in network byte order (big-endian).