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<title>logresolve - Resolve IP-addresses to hostnames in Apache
log files - Apache HTTP Server</title>
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log files</h1>
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<p><code>logresolve</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>
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<h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
<p><code><strong>logresolve</strong> [ -<strong>s</strong>
<var>filename</var> ] [ -<strong>c</strong> ] <
<var>access_log</var> > <var>access_log.new</var></code></p>
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<h2><a name="options" id="options">Options</a></h2>
<dl>
<dt><code>-s <var>filename</var></code></dt>
<dd>Specifies a filename to record statistics.</dd>
<dt><code>-c</code></dt>
<dd>This causes <code>logresolve</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>
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</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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