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62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<hr>
eb9b6f817df5c660be9f00fc5d27fe33479fdc98Adam Moore</div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<div class="refentry">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<a name="man.dig"></a><div class="titlepage"></div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="refnamediv">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<h2>Name</h2>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore dig
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore &#8212; DNS lookup utility
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore</div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="refsynopsisdiv">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<h2>Synopsis</h2>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="cmdsynopsis"><p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="command">dig</code>
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore [@server]
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore [<code class="option">-b <em class="replaceable"><code>address</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-c <em class="replaceable"><code>class</code></em></code>]
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore [<code class="option">-f <em class="replaceable"><code>filename</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-k <em class="replaceable"><code>filename</code></em></code>]
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore [<code class="option">-m</code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-p <em class="replaceable"><code>port#</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-q <em class="replaceable"><code>name</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-t <em class="replaceable"><code>type</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-v</code>]
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore [<code class="option">-x <em class="replaceable"><code>addr</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]name:key</code></em></code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore [<code class="option">-4</code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore | [<code class="option">-6</code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore ]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [name]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [type]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [class]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [queryopt...]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p></div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore <div class="cmdsynopsis"><p>
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore <code class="command">dig</code>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [<code class="option">-h</code>]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p></div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="cmdsynopsis"><p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="command">dig</code>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [global-queryopt...]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore [query...]
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p></div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="refsection">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<a name="id-1.14.2.7"></a><h2>DESCRIPTION</h2>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p><span class="command"><strong>dig</strong></span> is a flexible tool
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore for interrogating DNS name servers. It performs DNS lookups and
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore displays the answers that are returned from the name server(s) that
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore were queried. Most DNS administrators use <span class="command"><strong>dig</strong></span> to
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore troubleshoot DNS problems because of its flexibility, ease of use and
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore clarity of output. Other lookup tools tend to have less functionality
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore than <span class="command"><strong>dig</strong></span>.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore Although <span class="command"><strong>dig</strong></span> is normally used with
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore command-line
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore arguments, it also has a batch mode of operation for reading lookup
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore requests from a file. A brief summary of its command-line arguments
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore and options is printed when the <code class="option">-h</code> option is given.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore Unlike earlier versions, the BIND 9 implementation of
eb9b6f817df5c660be9f00fc5d27fe33479fdc98Adam Moore <span class="command"><strong>dig</strong></span> allows multiple lookups to be issued
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore from the
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore command line.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore Unless it is told to query a specific name server,
eb9b6f817df5c660be9f00fc5d27fe33479fdc98Adam Moore <span class="command"><strong>dig</strong></span> will try each of the servers listed in
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="filename">/etc/resolv.conf</code>. If no usable server addresses
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore are found, <span class="command"><strong>dig</strong></span> will send the query to the local
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore host.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore When no command line arguments or options are given,
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <span class="command"><strong>dig</strong></span> will perform an NS query for "." (the root).
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore It is possible to set per-user defaults for <span class="command"><strong>dig</strong></span> via
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="filename">${HOME}/.digrc</code>. This file is read and
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore any options in it
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore are applied before the command line arguments.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore The IN and CH class names overlap with the IN and CH top level
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore domain names. Either use the <code class="option">-t</code> and
ee4d8528357b157539bc45a7324cb16d46a88272Adam Moore <code class="option">-c</code> options to specify the type and class,
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore use the <code class="option">-q</code> the specify the domain name, or
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore use "IN." and "CH." when looking up these top level domains.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="refsection">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<a name="id-1.14.2.8"></a><h2>SIMPLE USAGE</h2>
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore A typical invocation of <span class="command"><strong>dig</strong></span> looks like:
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore<pre class="programlisting"> dig @server name type </pre>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore where:
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
23492c030b5a96aa8cfebad905225f03203e680cAdam Moore<div class="variablelist"><dl class="variablelist">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term"><code class="constant">server</code></span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore is the name or IP address of the name server to query. This
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore can be an IPv4 address in dotted-decimal notation or an IPv6
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore address in colon-delimited notation. When the supplied
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <em class="parameter"><code>server</code></em> argument is a hostname,
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <span class="command"><strong>dig</strong></span> resolves that name before querying
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore that name server.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore If no <em class="parameter"><code>server</code></em> argument is
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore provided, <span class="command"><strong>dig</strong></span> consults
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="filename">/etc/resolv.conf</code>; if an
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore address is found there, it queries the name server at
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore that address. If either of the <code class="option">-4</code> or
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="option">-6</code> options are in use, then
eb9b6f817df5c660be9f00fc5d27fe33479fdc98Adam Moore only addresses for the corresponding transport
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore will be tried. If no usable addresses are found,
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <span class="command"><strong>dig</strong></span> will send the query to the
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore local host. The reply from the name server that
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore responds is displayed.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term"><code class="constant">name</code></span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore is the name of the resource record that is to be looked up.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term"><code class="constant">type</code></span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore indicates what type of query is required &#8212;
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore ANY, A, MX, SIG, etc.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <em class="parameter"><code>type</code></em> can be any valid query
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore type. If no
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <em class="parameter"><code>type</code></em> argument is supplied,
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <span class="command"><strong>dig</strong></span> will perform a lookup for an
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore A record.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore</dl></div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </div>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="refsection">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<a name="id-1.14.2.9"></a><h2>OPTIONS</h2>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <div class="variablelist"><dl class="variablelist">
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term">-4</span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore Use IPv4 only.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term">-6</span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore Use IPv6 only.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term">-b <em class="replaceable"><code>address[<span class="optional">#port</span>]</code></em></span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore Set the source IP address of the query.
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore The <em class="parameter"><code>address</code></em> must be a valid address on
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore one of the host's network interfaces, or "0.0.0.0" or "::". An
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore optional port may be specified by appending "#&lt;port&gt;"
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore </p>
ee1f27f246004acce593dcb50c6a069c1d8edd9eAdam Moore </dd>
ee1f27f246004acce593dcb50c6a069c1d8edd9eAdam Moore<dt><span class="term">-c <em class="replaceable"><code>class</code></em></span></dt>
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore<dd>
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore <p>
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore Set the query class. The
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore default <em class="parameter"><code>class</code></em> is IN; other classes
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore are HS for Hesiod records or CH for Chaosnet records.
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore </p>
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore </dd>
3674931fc5c32e4e1b79f0273b8a7477b5ccd08bAdam Moore<dt><span class="term">-f <em class="replaceable"><code>file</code></em></span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore Batch mode: <span class="command"><strong>dig</strong></span> reads a list of lookup
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore requests to process from the
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore given <em class="parameter"><code>file</code></em>. Each line in the file
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore should be organized in the same way they would be
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore presented as queries to
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <span class="command"><strong>dig</strong></span> using the command-line interface.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore<dt><span class="term">-i</span></dt>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore<dd>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore <p>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore Do reverse IPv6 lookups using the obsolete RFC1886 IP6.INT
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore domain, which is no longer in use. Obsolete bit string
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore label queries (RFC2874) are not attempted.
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore </p>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore </dd>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore<dt><span class="term">-k <em class="replaceable"><code>keyfile</code></em></span></dt>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore<dd>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore <p>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore Sign queries using TSIG using a key read from the given file.
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore Key files can be generated using
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore <span class="citerefentry">
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore <span class="refentrytitle">tsig-keygen</span>(8)
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore </span>.
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore When using TSIG authentication with <span class="command"><strong>dig</strong></span>,
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore the name server that is queried needs to know the key and
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore algorithm that is being used. In BIND, this is done by
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore providing appropriate <span class="command"><strong>key</strong></span>
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore and <span class="command"><strong>server</strong></span> statements in
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <code class="filename">named.conf</code>.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term">-m</span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore Enable memory usage debugging.
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore </p>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore </dd>
91095b24ae0db3610e7924c776f7a86cd681fb1cAdam Moore<dt><span class="term">-p <em class="replaceable"><code>port</code></em></span></dt>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore<dd>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore <p>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore Send the query to a non-standard port on the server,
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore instead of the default port 53. This option would be used
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore to test a name server that has been configured to listen
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore for queries on a non-standard port number.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore<dt><span class="term">-q <em class="replaceable"><code>name</code></em></span></dt>
1a86ff82405008489db03fbd648e982b4dc99ea8Adam Moore<dd>
eb9b6f817df5c660be9f00fc5d27fe33479fdc98Adam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore The domain name to query. This is useful to distinguish
fd998dcd768f39fdafd1e5ff99c72f295c5ecad9Adam Moore the <em class="parameter"><code>name</code></em> from other arguments.
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore </dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dt><span class="term">-t <em class="replaceable"><code>type</code></em></span></dt>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore<dd>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore <p>
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore The resource record type to query. It can be any valid query type
62e7a7d39cc0c6d25fec20964c26bc35b9fa116aAdam Moore which is
3c803ac3b53ba983a143b03bf688bc67b1a9db2bAdam Moore supported in BIND 9. The default query type is "A", unless the
3c803ac3b53ba983a143b03bf688bc67b1a9db2bAdam Moore <code class="option">-x</code> option is supplied to indicate a reverse lookup.
A zone transfer can be requested by specifying a type of AXFR. When
an incremental zone transfer (IXFR) is required, set the
<em class="parameter"><code>type</code></em> to <code class="literal">ixfr=N</code>.
The incremental zone transfer will contain the changes
made to the zone since the serial number in the zone's SOA
record was
<em class="parameter"><code>N</code></em>.
</p>
</dd>
<dt><span class="term">-v</span></dt>
<dd>
<p>
Print the version number and exit.
</p>
</dd>
<dt><span class="term">-x <em class="replaceable"><code>addr</code></em></span></dt>
<dd>
<p>
Simplified reverse lookups, for mapping addresses to
names. The <em class="parameter"><code>addr</code></em> is an IPv4 address
in dotted-decimal notation, or a colon-delimited IPv6
address. When the <code class="option">-x</code> is used, there is no
need to provide
the <em class="parameter"><code>name</code></em>, <em class="parameter"><code>class</code></em>
and <em class="parameter"><code>type</code></em>
arguments. <span class="command"><strong>dig</strong></span> automatically performs a
lookup for a name like
<code class="literal">94.2.0.192.in-addr.arpa</code> and sets the
query type and class to PTR and IN respectively. IPv6
addresses are looked up using nibble format under the
IP6.ARPA domain (but see also the <code class="option">-i</code>
option).
</p>
</dd>
<dt><span class="term">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]keyname:secret</code></em></span></dt>
<dd>
<p>
Sign queries using TSIG with the given authentication key.
<em class="parameter"><code>keyname</code></em> is the name of the key, and
<em class="parameter"><code>secret</code></em> is the base64 encoded shared secret.
<em class="parameter"><code>hmac</code></em> is the name of the key algorithm;
valid choices are <code class="literal">hmac-md5</code>,
<code class="literal">hmac-sha1</code>, <code class="literal">hmac-sha224</code>,
<code class="literal">hmac-sha256</code>, <code class="literal">hmac-sha384</code>, or
<code class="literal">hmac-sha512</code>. If <em class="parameter"><code>hmac</code></em>
is not specified, the default is <code class="literal">hmac-md5</code>
or if MD5 was disabled <code class="literal">hmac-sha256</code>.
</p>
<p>
NOTE: You should use the <code class="option">-k</code> option and
avoid the <code class="option">-y</code> option, because
with <code class="option">-y</code> the shared secret is supplied as
a command line argument in clear text. This may be visible
in the output from
<span class="citerefentry">
<span class="refentrytitle">ps</span>(1)
</span>
or in a history file maintained by the user's shell.
</p>
</dd>
</dl></div>
</div>
<div class="refsection">
<a name="id-1.14.2.10"></a><h2>QUERY OPTIONS</h2>
<p><span class="command"><strong>dig</strong></span>
provides a number of query options which affect
the way in which lookups are made and the results displayed. Some of
these set or reset flag bits in the query header, some determine which
sections of the answer get printed, and others determine the timeout
and retry strategies.
</p>
<p>
Each query option is identified by a keyword preceded by a plus sign
(<code class="literal">+</code>). Some keywords set or reset an
option. These may be preceded
by the string <code class="literal">no</code> to negate the meaning of
that keyword. Other
keywords assign values to options like the timeout interval. They
have the form <code class="option">+keyword=value</code>.
Keywords may be abbreviated, provided the abbreviation is
unambiguous; for example, <code class="literal">+cd</code> is equivalent
to <code class="literal">+cdflag</code>.
The query options are:
</p>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term"><code class="option">+[no]aaflag</code></span></dt>
<dd>
<p>
A synonym for <em class="parameter"><code>+[no]aaonly</code></em>.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]aaonly</code></span></dt>
<dd>
<p>
Sets the "aa" flag in the query.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]additional</code></span></dt>
<dd>
<p>
Display [do not display] the additional section of a
reply. The default is to display it.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]adflag</code></span></dt>
<dd>
<p>
Set [do not set] the AD (authentic data) bit in the
query. This requests the server to return whether
all of the answer and authority sections have all
been validated as secure according to the security
policy of the server. AD=1 indicates that all records
have been validated as secure and the answer is not
from a OPT-OUT range. AD=0 indicate that some part
of the answer was insecure or not validated. This
bit is set by default.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]all</code></span></dt>
<dd>
<p>
Set or clear all display flags.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]answer</code></span></dt>
<dd>
<p>
Display [do not display] the answer section of a
reply. The default is to display it.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]authority</code></span></dt>
<dd>
<p>
Display [do not display] the authority section of a
reply. The default is to display it.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]badcookie</code></span></dt>
<dd>
<p>
Retry lookup with the new server cookie if a
BADCOOKIE response is received.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]besteffort</code></span></dt>
<dd>
<p>
Attempt to display the contents of messages which are
malformed. The default is to not display malformed
answers.
</p>
</dd>
<dt><span class="term"><code class="option">+bufsize=B</code></span></dt>
<dd>
<p>
Set the UDP message buffer size advertised using EDNS0
to <em class="parameter"><code>B</code></em> bytes. The maximum and
minimum sizes of this buffer are 65535 and 0 respectively.
Values outside this range are rounded up or down
appropriately. Values other than zero will cause a
EDNS query to be sent.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]cdflag</code></span></dt>
<dd>
<p>
Set [do not set] the CD (checking disabled) bit in
the query. This requests the server to not perform
DNSSEC validation of responses.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]class</code></span></dt>
<dd>
<p>
Display [do not display] the CLASS when printing the
record.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]cmd</code></span></dt>
<dd>
<p>
Toggles the printing of the initial comment in the
output identifying the version of <span class="command"><strong>dig</strong></span>
and the query options that have been applied. This
comment is printed by default.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]comments</code></span></dt>
<dd>
<p>
Toggle the display of comment lines in the output.
The default is to print comments.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]cookie[<span class="optional">=####</span>]</code></span></dt>
<dd>
<p>
Send a COOKIE EDNS option, with optional
value. Replaying a COOKIE from a previous response will
allow the server to identify a previous client. The
default is <code class="option">+cookie</code>.
</p>
<p>
<span class="command"><strong>+cookie</strong></span> is also set when +trace
is set to better emulate the default queries from a
nameserver.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]crypto</code></span></dt>
<dd>
<p>
Toggle the display of cryptographic fields in DNSSEC
records. The contents of these field are unnecessary
to debug most DNSSEC validation failures and removing
them makes it easier to see the common failures. The
default is to display the fields. When omitted they
are replaced by the string "[omitted]" or in the
DNSKEY case the key id is displayed as the replacement,
e.g. "[ key id = value ]".
</p>
</dd>
<dt><span class="term"><code class="option">+[no]defname</code></span></dt>
<dd>
<p>
Deprecated, treated as a synonym for
<em class="parameter"><code>+[no]search</code></em>
</p>
</dd>
<dt><span class="term"><code class="option">+[no]dnssec</code></span></dt>
<dd>
<p>
Requests DNSSEC records be sent by setting the DNSSEC
OK bit (DO) in the OPT record in the additional section
of the query.
</p>
</dd>
<dt><span class="term"><code class="option">+domain=somename</code></span></dt>
<dd>
<p>
Set the search list to contain the single domain
<em class="parameter"><code>somename</code></em>, as if specified in
a <span class="command"><strong>domain</strong></span> directive in
<code class="filename">/etc/resolv.conf</code>, and enable
search list processing as if the
<em class="parameter"><code>+search</code></em> option were given.
</p>
</dd>
<dt><span class="term"><code class="option">+dscp=value</code></span></dt>
<dd>
<p>
Set the DSCP code point to be used when sending the
query. Valid DSCP code points are in the range
[0..63]. By default no code point is explicitly set.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]edns[=#]</code></span></dt>
<dd>
<p>
Specify the EDNS version to query with. Valid values
are 0 to 255. Setting the EDNS version will cause
a EDNS query to be sent. <code class="option">+noedns</code>
clears the remembered EDNS version. EDNS is set to
0 by default.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]ednsflags[=#]</code></span></dt>
<dd>
<p>
Set the must-be-zero EDNS flags bits (Z bits) to the
specified value. Decimal, hex and octal encodings are
accepted. Setting a named flag (e.g. DO) will silently be
ignored. By default, no Z bits are set.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]ednsnegotiation</code></span></dt>
<dd>
<p>
Enable / disable EDNS version negotiation. By default
EDNS version negotiation is enabled.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]ednsopt[=code[:value]]</code></span></dt>
<dd>
<p>
Specify EDNS option with code point <code class="option">code</code>
and optionally payload of <code class="option">value</code> as a
hexadecimal string. <code class="option">code</code> can be
either an EDNS option name (for example,
<code class="literal">NSID</code> or <code class="literal">ECS</code>),
or an arbitrary numeric value. <code class="option">+noednsopt</code>
clears the EDNS options to be sent.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]expire</code></span></dt>
<dd>
<p>
Send an EDNS Expire option.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]fail</code></span></dt>
<dd>
<p>
Do not try the next server if you receive a SERVFAIL.
The default is to not try the next server which is
the reverse of normal stub resolver behavior.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]header-only</code></span></dt>
<dd>
<p>
Send a query with a DNS header without a question section.
The default is to add a question section. The query type
and query name are ignored when this is set.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]identify</code></span></dt>
<dd>
<p>
Show [or do not show] the IP address and port number
that supplied the answer when the
<em class="parameter"><code>+short</code></em> option is enabled. If
short form answers are requested, the default is not
to show the source address and port number of the
server that provided the answer.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]idnout</code></span></dt>
<dd>
<p>
Convert [do not convert] puny code on output.
This requires IDN SUPPORT to have been enabled at
compile time. The default is to convert output.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]ignore</code></span></dt>
<dd>
<p>
Ignore truncation in UDP responses instead of retrying
with TCP. By default, TCP retries are performed.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]keepopen</code></span></dt>
<dd>
<p>
Keep the TCP socket open between queries and reuse
it rather than creating a new TCP socket for each
lookup. The default is <code class="option">+nokeepopen</code>.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]mapped</code></span></dt>
<dd>
<p>
Allow mapped IPv4 over IPv6 addresses to be used. The
default is <code class="option">+mapped</code>.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]multiline</code></span></dt>
<dd>
<p>
Print records like the SOA records in a verbose
multi-line format with human-readable comments. The
default is to print each record on a single line, to
facilitate machine parsing of the <span class="command"><strong>dig</strong></span>
output.
</p>
</dd>
<dt><span class="term"><code class="option">+ndots=D</code></span></dt>
<dd>
<p>
Set the number of dots that have to appear in
<em class="parameter"><code>name</code></em> to <em class="parameter"><code>D</code></em>
for it to be considered absolute. The default value
is that defined using the ndots statement in
<code class="filename">/etc/resolv.conf</code>, or 1 if no
ndots statement is present. Names with fewer dots
are interpreted as relative names and will be searched
for in the domains listed in the <code class="option">search</code>
or <code class="option">domain</code> directive in
<code class="filename">/etc/resolv.conf</code> if
<code class="option">+search</code> is set.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]nsid</code></span></dt>
<dd>
<p>
Include an EDNS name server ID request when sending
a query.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]nssearch</code></span></dt>
<dd>
<p>
When this option is set, <span class="command"><strong>dig</strong></span>
attempts to find the authoritative name servers for
the zone containing the name being looked up and
display the SOA record that each name server has for
the zone.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]onesoa</code></span></dt>
<dd>
<p>
Print only one (starting) SOA record when performing
an AXFR. The default is to print both the starting
and ending SOA records.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]opcode=value</code></span></dt>
<dd>
<p>
Set [restore] the DNS message opcode to the specified
value. The default value is QUERY (0).
</p>
</dd>
<dt><span class="term"><code class="option">+[no]qr</code></span></dt>
<dd>
<p>
Print [do not print] the query as it is sent. By
default, the query is not printed.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]question</code></span></dt>
<dd>
<p>
Print [do not print] the question section of a query
when an answer is returned. The default is to print
the question section as a comment.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]rdflag</code></span></dt>
<dd>
<p>
A synonym for <em class="parameter"><code>+[no]recurse</code></em>.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]recurse</code></span></dt>
<dd>
<p>
Toggle the setting of the RD (recursion desired) bit
in the query. This bit is set by default, which means
<span class="command"><strong>dig</strong></span> normally sends recursive
queries. Recursion is automatically disabled when
the <em class="parameter"><code>+nssearch</code></em> or
<em class="parameter"><code>+trace</code></em> query options are used.
</p>
</dd>
<dt><span class="term"><code class="option">+retry=T</code></span></dt>
<dd>
<p>
Sets the number of times to retry UDP queries to
server to <em class="parameter"><code>T</code></em> instead of the
default, 2. Unlike <em class="parameter"><code>+tries</code></em>,
this does not include the initial query.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]rrcomments</code></span></dt>
<dd>
<p>
Toggle the display of per-record comments in the
output (for example, human-readable key information
about DNSKEY records). The default is not to print
record comments unless multiline mode is active.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]search</code></span></dt>
<dd>
<p>
Use [do not use] the search list defined by the
searchlist or domain directive in
<code class="filename">resolv.conf</code> (if any). The search
list is not used by default.
</p>
<p>
'ndots' from <code class="filename">resolv.conf</code> (default 1)
which may be overridden by <em class="parameter"><code>+ndots</code></em>
determines if the name will be treated as relative
or not and hence whether a search is eventually
performed or not.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]short</code></span></dt>
<dd>
<p>
Provide a terse answer. The default is to print the
answer in a verbose form.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]showsearch</code></span></dt>
<dd>
<p>
Perform [do not perform] a search showing intermediate
results.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]sigchase</code></span></dt>
<dd>
<p>
Chase DNSSEC signature chains. Requires dig be compiled
with -DDIG_SIGCHASE. This feature is deprecated.
Use <span class="command"><strong>delv</strong></span> instead.
</p>
</dd>
<dt><span class="term"><code class="option">+split=W</code></span></dt>
<dd>
<p>
Split long hex- or base64-formatted fields in resource
records into chunks of <em class="parameter"><code>W</code></em>
characters (where <em class="parameter"><code>W</code></em> is rounded
up to the nearest multiple of 4).
<em class="parameter"><code>+nosplit</code></em> or
<em class="parameter"><code>+split=0</code></em> causes fields not to
be split at all. The default is 56 characters, or
44 characters when multiline mode is active.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]stats</code></span></dt>
<dd>
<p>
This query option toggles the printing of statistics:
when the query was made, the size of the reply and
so on. The default behavior is to print the query
statistics.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]subnet=addr[/prefix-length]</code></span></dt>
<dd>
<p>
Send (don't send) an EDNS Client Subnet option with the
specified IP address or network prefix.
</p>
<p>
<span class="command"><strong>dig +subnet=0.0.0.0/0</strong></span>, or simply
<span class="command"><strong>dig +subnet=0</strong></span> for short, sends an EDNS
CLIENT-SUBNET option with an empty address and a source
prefix-length of zero, which signals a resolver that
the client's address information must
<span class="emphasis"><em>not</em></span> be used when resolving
this query.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]tcp</code></span></dt>
<dd>
<p>
Use [do not use] TCP when querying name servers. The
default behavior is to use UDP unless a type
<code class="literal">any</code> or <code class="literal">ixfr=N</code>
query is requested, in which case the default is TCP.
AXFR queries always use TCP.
</p>
</dd>
<dt><span class="term"><code class="option">+timeout=T</code></span></dt>
<dd>
<p>
Sets the timeout for a query to
<em class="parameter"><code>T</code></em> seconds. The default
timeout is 5 seconds.
An attempt to set <em class="parameter"><code>T</code></em> to less
than 1 will result
in a query timeout of 1 second being applied.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]topdown</code></span></dt>
<dd>
<p>
When chasing DNSSEC signature chains perform a top-down
validation. Requires dig be compiled with -DDIG_SIGCHASE.
This feature is deprecated. Use <span class="command"><strong>delv</strong></span> instead.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]trace</code></span></dt>
<dd>
<p>
Toggle tracing of the delegation path from the root
name servers for the name being looked up. Tracing
is disabled by default. When tracing is enabled,
<span class="command"><strong>dig</strong></span> makes iterative queries to
resolve the name being looked up. It will follow
referrals from the root servers, showing the answer
from each server that was used to resolve the lookup.
</p> <p>
If @server is also specified, it affects only the
initial query for the root zone name servers.
</p> <p>
<span class="command"><strong>+dnssec</strong></span> is also set when +trace
is set to better emulate the default queries from a
nameserver.
</p>
</dd>
<dt><span class="term"><code class="option">+tries=T</code></span></dt>
<dd>
<p>
Sets the number of times to try UDP queries to server
to <em class="parameter"><code>T</code></em> instead of the default,
3. If <em class="parameter"><code>T</code></em> is less than or equal
to zero, the number of tries is silently rounded up
to 1.
</p>
</dd>
<dt><span class="term"><code class="option">+trusted-key=####</code></span></dt>
<dd>
<p>
Specifies a file containing trusted keys to be used
with <code class="option">+sigchase</code>. Each DNSKEY record
must be on its own line.
</p> <p>
If not specified, <span class="command"><strong>dig</strong></span> will look
for <code class="filename">/etc/trusted-key.key</code> then
<code class="filename">trusted-key.key</code> in the current
directory.
</p> <p>
Requires dig be compiled with -DDIG_SIGCHASE.
This feature is deprecated. Use <span class="command"><strong>delv</strong></span> instead.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]ttlid</code></span></dt>
<dd>
<p>
Display [do not display] the TTL when printing the
record.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]ttlunits</code></span></dt>
<dd>
<p>
Display [do not display] the TTL in friendly human-readable
time units of "s", "m", "h", "d", and "w", representing
seconds, minutes, hours, days and weeks. Implies +ttlid.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]unknownformat</code></span></dt>
<dd>
<p>
Print all RDATA in unknown RR type presentation format
(RFC 3597). The default is to print RDATA for known types
in the type's presentation format.
</p>
</dd>
<dt><span class="term"><code class="option">+[no]vc</code></span></dt>
<dd>
<p>
Use [do not use] TCP when querying name servers. This
alternate syntax to <em class="parameter"><code>+[no]tcp</code></em>
is provided for backwards compatibility. The "vc"
stands for "virtual circuit".
</p>
</dd>
<dt><span class="term"><code class="option">+[no]zflag</code></span></dt>
<dd>
<p>
Set [do not set] the last unassigned DNS header flag in a
DNS query. This flag is off by default.
</p>
</dd>
</dl></div>
<p>
</p>
</div>
<div class="refsection">
<a name="id-1.14.2.11"></a><h2>MULTIPLE QUERIES</h2>
<p>
The BIND 9 implementation of <span class="command"><strong>dig </strong></span>
supports
specifying multiple queries on the command line (in addition to
supporting the <code class="option">-f</code> batch file option). Each of those
queries can be supplied with its own set of flags, options and query
options.
</p>
<p>
In this case, each <em class="parameter"><code>query</code></em> argument
represent an
individual query in the command-line syntax described above. Each
consists of any of the standard options and flags, the name to be
looked up, an optional query type and class and any query options that
should be applied to that query.
</p>
<p>
A global set of query options, which should be applied to all queries,
can also be supplied. These global query options must precede the
first tuple of name, class, type, options, flags, and query options
supplied on the command line. Any global query options (except
the <code class="option">+[no]cmd</code> option) can be
overridden by a query-specific set of query options. For example:
</p>
<pre class="programlisting">
dig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
</pre>
<p>
shows how <span class="command"><strong>dig</strong></span> could be used from the
command line
to make three lookups: an ANY query for <code class="literal">www.isc.org</code>, a
reverse lookup of 127.0.0.1 and a query for the NS records of
<code class="literal">isc.org</code>.
A global query option of <em class="parameter"><code>+qr</code></em> is
applied, so
that <span class="command"><strong>dig</strong></span> shows the initial query it made
for each
lookup. The final query has a local query option of
<em class="parameter"><code>+noqr</code></em> which means that <span class="command"><strong>dig</strong></span>
will not print the initial query when it looks up the NS records for
<code class="literal">isc.org</code>.
</p>
</div>
<div class="refsection">
<a name="id-1.14.2.12"></a><h2>IDN SUPPORT</h2>
<p>
If <span class="command"><strong>dig</strong></span> has been built with IDN (internationalized
domain name) support, it can accept and display non-ASCII domain names.
<span class="command"><strong>dig</strong></span> appropriately converts character encoding of
domain name before sending a request to DNS server or displaying a
reply from the server.
If you'd like to turn off the IDN support for some reason, defines
the <code class="envar">IDN_DISABLE</code> environment variable.
The IDN support is disabled if the variable is set when
<span class="command"><strong>dig</strong></span> runs.
</p>
</div>
<div class="refsection">
<a name="id-1.14.2.13"></a><h2>FILES</h2>
<p><code class="filename">/etc/resolv.conf</code>
</p>
<p><code class="filename">${HOME}/.digrc</code>
</p>
</div>
<div class="refsection">
<a name="id-1.14.2.14"></a><h2>SEE ALSO</h2>
<p><span class="citerefentry">
<span class="refentrytitle">delv</span>(1)
</span>,
<span class="citerefentry">
<span class="refentrytitle">host</span>(1)
</span>,
<span class="citerefentry">
<span class="refentrytitle">named</span>(8)
</span>,
<span class="citerefentry">
<span class="refentrytitle">dnssec-keygen</span>(8)
</span>,
<em class="citetitle">RFC1035</em>.
</p>
</div>
<div class="refsection">
<a name="id-1.14.2.15"></a><h2>BUGS</h2>
<p>
There are probably too many query options.
</p>
</div>
</div>
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