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<title>logresolve - Resolve IP-addresses to hostnames in Apache
   log files - Apache HTTP Server Version 2.4</title>
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<p><code class="program"><a href="../programs/logresolve.html">logresolve</a></code> is a post-processing program to
     resolve IP-addresses in Apache's access logfiles.  To minimize
     impact on your nameserver, logresolve has its very own internal
     hash-table cache.  This means that each IP number will only be
     looked up the first time it is found in the log file.</p>

<p>Takes an Apache log file on standard input.  The IP addresses
     must be the first thing on each line and must be separated from
     the remainder of the line by a space.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../../images/down.gif"> <a href="#synopsis">Synopsis</a></li>
<li><img alt="" src="../../images/down.gif"> <a href="#options">Options</a></li>
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<h2 id="synopsis">Synopsis <a title="Permanent link" href="#synopsis" class="permalink">&para;</a></h2>

<p><code><strong>logresolve</strong> [ -<strong>s</strong>
     <var>filename</var> ] [ -<strong>c</strong> ] &lt;
     <var>access_log</var> &gt; <var>access_log.new</var></code></p>
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<h2 id="options">Options <a title="Permanent link" href="#options" class="permalink">&para;</a></h2>

<dl>

<dt><code>-s <var>filename</var></code></dt>

<dd>Specifies a filename to record statistics.</dd>

<dd>This causes <code class="program"><a href="../programs/logresolve.html">logresolve</a></code> to apply some DNS checks:
after finding the hostname from the IP address, it looks up the IP
addresses for the hostname and checks that one of these matches the
original address.</dd>

</dl>
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