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<title>logresolve - Resolve IP-addresses to hostnames in Apache
log files - Apache HTTP Server Version 2.2</title>
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<p class="apache">Apache HTTP Server Version 2.2</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.2</a> > <a href="./">Programs</a></div><div id="page-content"><div class="retired"><h4>Please note</h4>
<p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
<p>You may follow <a href="http://httpd.apache.org/docs/current/programs/logresolve.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>logresolve - Resolve IP-addresses to hostnames in Apache
log files</h1>
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<p><span>Available Languages: </span><a href="../en/programs/logresolve.html" title="English"> en </a> |
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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>
</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>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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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>
</dl>
</div></div>
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