[582] | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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| 2 | <html>
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| 3 | <head>
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| 4 | <title>IP Database Reverse DNS Help</title>
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| 5 | <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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| 6 | <link rel="stylesheet" type="text/css" href="ipdb.css">
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| 7 | <link rel="stylesheet" type="text/css" href="local.css">
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| 8 | </head>
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| 9 | <body>
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| 10 |
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| 11 | <p>
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| 12 | The IP Database can pass reverse DNS information back and forth to a DNS management backend to simplify
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| 13 | maintenance of the reverse DNS records associated with the IPs being managed.</p>
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| 14 |
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| 15 | <p>Reverse zones are created on /16 or /24 boundaries for IPv4, since simple classful delegation can't be done
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| 16 | at other boundaries anyway.</p>
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| 17 |
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| 18 | <p>Several shortcuts can be used when specifying a pattern for an IPv4 netblock, which will be expanded to
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| 19 | actual DNS records by the DNS management system.</p>
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| 20 |
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| 21 | <table class="regular" cellspacing="1" cellpadding="1" bgcolor="#000000">
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| 22 | <tr class="header"><td></td><td>Substitution pattern</td><td>Example expansion using 192.168.23.45</td></tr>
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| 23 |
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| 24 | <tr class="header"><td colspan="3">Whole-IP patterns</td></tr>
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| 25 | <tr class="row0"><td>Dashed IP</td><td>%i</td><td>192-168-23-45</td></tr>
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| 26 | <tr class="row1"><td>Reverse dashed IP</td><td>%r</td><td>45-23-168-192</td></tr>
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| 27 | <tr class="row0"><td>Hex-coded IP</td><td>%h</td><td>c0a8172d</td></tr>
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| 28 | <tr class="row1"><td>Decimal IP</td><td>%d</td><td>323241453</td></tr>
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| 29 |
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| 30 | <tr class="header"><td colspan="3">Per-octet patterns (1, 2, 3, or 4 specify the octet; d, h or 0
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| 31 | specify decimal, hexidecimal, or 0-padded decimal)</td>
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| 32 | <tr class="row0"><td>First octet, decimal</td><td>%1d</td><td>192</td></tr>
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| 33 | <tr class="row1"><td>Third octet, 0-padded</td><td>%30</td><td>023</td></tr>
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| 34 | <tr class="row0"><td>Fourth octet, hexidecimal</td><td>%4h</td><td>2d</td></tr>
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| 35 | <tr class="row1"><td>All octets, different expansions</td><td>%1h-%2d-%30-%4h</td><td>c0-168-023-2d</td></tr>
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| 36 |
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| 37 | </table>
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| 38 |
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| 39 | </body></html>
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