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8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<h2>Name</h2>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<p>dig &#8212; DNS lookup utility</p>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber</div>
807f4c9e1eaae674c76fd3a97d0b4a8810004177Jamie Strandboge<div class="refsynopsisdiv">
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<h2>Synopsis</h2>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<div class="cmdsynopsis"><p><code class="command">dig</code> [@server] [<code class="option">-b <em class="replaceable"><code>address</code></em></code>] [<code class="option">-c <em class="replaceable"><code>class</code></em></code>] [<code class="option">-f <em class="replaceable"><code>filename</code></em></code>] [<code class="option">-k <em class="replaceable"><code>filename</code></em></code>] [<code class="option">-p <em class="replaceable"><code>port#</code></em></code>] [<code class="option">-q <em class="replaceable"><code>name</code></em></code>] [<code class="option">-t <em class="replaceable"><code>type</code></em></code>] [<code class="option">-x <em class="replaceable"><code>addr</code></em></code>] [<code class="option">-y <em class="replaceable"><code>name:key</code></em></code>] [<code class="option">-4</code>] [<code class="option">-6</code>] [name] [type] [class] [queryopt...]</p></div>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<div class="cmdsynopsis"><p><code class="command">dig</code> [<code class="option">-h</code>]</p></div>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<div class="cmdsynopsis"><p><code class="command">dig</code> [global-queryopt...] [query...]</p></div>
f2f545857cd6b06689bb1220d66d3577f802dbbcJesse Tane</div>
f2f545857cd6b06689bb1220d66d3577f802dbbcJesse Tane<div class="refsect1" lang="en">
f2f545857cd6b06689bb1220d66d3577f802dbbcJesse Tane<a name="id2544716"></a><h2>DESCRIPTION</h2>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<p><span><strong class="command">dig</strong></span>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber (domain information groper) is a flexible tool
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber for interrogating DNS name servers. It performs DNS lookups and
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber displays the answers that are returned from the name server(s) that
b03f1f4ac3666abd032ddc617823213568ad577bStéphane Graber were queried. Most DNS administrators use <span><strong class="command">dig</strong></span> to
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber troubleshoot DNS problems because of its flexibility, ease of use and
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber clarity of output. Other lookup tools tend to have less functionality
4845c17aff570c25e05c5347dfdcd577cb108d47Serge Hallyn than <span><strong class="command">dig</strong></span>.
4845c17aff570c25e05c5347dfdcd577cb108d47Serge Hallyn </p>
4845c17aff570c25e05c5347dfdcd577cb108d47Serge Hallyn<p>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber Although <span><strong class="command">dig</strong></span> is normally used with
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber command-line
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber arguments, it also has a batch mode of operation for reading lookup
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber requests from a file. A brief summary of its command-line arguments
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber and options is printed when the <code class="option">-h</code> option is given.
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber Unlike earlier versions, the BIND9 implementation of
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber <span><strong class="command">dig</strong></span> allows multiple lookups to be issued
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber from the
98b745498bf97637f68311f944903777f3ee1e67Stéphane Graber command line.
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber </p>
98b745498bf97637f68311f944903777f3ee1e67Stéphane Graber<p>
98b745498bf97637f68311f944903777f3ee1e67Stéphane Graber Unless it is told to query a specific name server,
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber <span><strong class="command">dig</strong></span> will try each of the servers listed
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber in
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber <code class="filename">/etc/resolv.conf</code>.
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber </p>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<p>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber When no command line arguments or options are given, will perform an
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber NS query for "." (the root).
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber </p>
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber<p>
056f8bba0d86ca2ba481a932f23faff9db2ef588Stéphane Graber It is possible to set per-user defaults for <span><strong class="command">dig</strong></span> via
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber <code class="filename">${HOME}/.digrc</code>. This file is read and
8da250dad4b11c4983031742a83fb8f358044fe0Stéphane Graber any options in it
c08a0b7c4e459f32a939391bc5c9667eb7c7ab5cSerge Hallyn are applied before the command line arguments.
056f8bba0d86ca2ba481a932f23faff9db2ef588Stéphane Graber </p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn</div>
537188a8eefd6df82995e71f453fce4d6622b110Serge Hallyn<div class="refsect1" lang="en">
537188a8eefd6df82995e71f453fce4d6622b110Serge Hallyn<a name="id2544859"></a><h2>SIMPLE USAGE</h2>
537188a8eefd6df82995e71f453fce4d6622b110Serge Hallyn<p>
549a40b6128892112895299e445e0564c3faaea2Stéphane Graber A typical invocation of <span><strong class="command">dig</strong></span> looks like:
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber </p>
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber<pre class="programlisting"> dig @server name type </pre>
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber<p>
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber where:
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber </p>
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber<div class="variablelist"><dl>
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber<dt><span class="term"><code class="constant">server</code></span></dt>
564ad051ce487e5f684feb4ace09545ef9e1b9d5Stéphane Graber<dd><p>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber is the name or IP address of the name server to query. This can
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber be an IPv4
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber address in dotted-decimal notation or an IPv6
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber address in colon-delimited notation. When the supplied
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber <em class="parameter"><code>server</code></em> argument is a
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber hostname,
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber <span><strong class="command">dig</strong></span> resolves that name before
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber querying that name
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber server. If no <em class="parameter"><code>server</code></em>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber argument is provided,
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber <span><strong class="command">dig</strong></span> consults <code class="filename">/etc/resolv.conf</code>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber and queries the name servers listed there. The reply from the
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber name
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber server that responds is displayed.
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber </p></dd>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber<dt><span class="term"><code class="constant">name</code></span></dt>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber<dd><p>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber is the name of the resource record that is to be looked up.
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber </p></dd>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber<dt><span class="term"><code class="constant">type</code></span></dt>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber<dd><p>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber indicates what type of query is required &#8212;
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber ANY, A, MX, SIG, etc.
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber <em class="parameter"><code>type</code></em> can be any valid query
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber type. If no
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber <em class="parameter"><code>type</code></em> argument is supplied,
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber <span><strong class="command">dig</strong></span> will perform a lookup for an
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber A record.
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber </p></dd>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber</dl></div>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber<p>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber </p>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber</div>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber<div class="refsect1" lang="en">
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber<a name="id2544970"></a><h2>OPTIONS</h2>
7e4c9a30feb3905902a158cde099f4510a54d5efStéphane Graber<p>
9a1d96120f578d35227895aff3852ef10a9e1b1dStéphane Graber The <code class="option">-b</code> option sets the source IP address of the query
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn to <em class="parameter"><code>address</code></em>. This must be a valid
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn address on
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn one of the host's network interfaces or "0.0.0.0" or "::". An optional
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn port
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn may be specified by appending "#&lt;port&gt;"
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn </p>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn<p>
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn The default query class (IN for internet) is overridden by the
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn <code class="option">-c</code> option. <em class="parameter"><code>class</code></em> is
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn any valid
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn class, such as HS for Hesiod records or CH for CHAOSNET records.
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn </p>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn<p>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn The <code class="option">-f</code> option makes <span><strong class="command">dig </strong></span>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn operate
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn in batch mode by reading a list of lookup requests to process from the
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn file <em class="parameter"><code>filename</code></em>. The file contains a
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn number of
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn queries, one per line. Each entry in the file should be organised in
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn the same way they would be presented as queries to
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn <span><strong class="command">dig</strong></span> using the command-line interface.
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn </p>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn<p>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn If a non-standard port number is to be queried, the
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn <code class="option">-p</code> option is used. <em class="parameter"><code>port#</code></em> is
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn the port number that <span><strong class="command">dig</strong></span> will send its
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn queries
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn instead of the standard DNS port number 53. This option would be used
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn to test a name server that has been configured to listen for queries
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn on a non-standard port number.
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn </p>
773bd28258371ad0058ff946c5cf94419920ffddSerge Hallyn<p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn The <code class="option">-4</code> option forces <span><strong class="command">dig</strong></span>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn to only
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn use IPv4 query transport. The <code class="option">-6</code> option forces
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn <span><strong class="command">dig</strong></span> to only use IPv6 query transport.
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn </p>
94a77f3fd8be2fb87f7d1465521fac3ec4b7e6b5Serge Hallyn<p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn The <code class="option">-t</code> option sets the query type to
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>type</code></em>. It can be any valid query type
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn which is
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn supported in BIND9. The default query type "A", unless the
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <code class="option">-x</code> option is supplied to indicate a reverse lookup.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn A zone transfer can be requested by specifying a type of AXFR. When
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn an incremental zone transfer (IXFR) is required,
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>type</code></em> is set to <code class="literal">ixfr=N</code>.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn The incremental zone transfer will contain the changes made to the zone
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn since the serial number in the zone's SOA record was
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>N</code></em>.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn </p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn<p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn The <code class="option">-q</code> option sets the query name to
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>name</code></em>. This useful do distingish the
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>name</code></em> from other arguments.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn </p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn<p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn Reverse lookups - mapping addresses to names - are simplified by the
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <code class="option">-x</code> option. <em class="parameter"><code>addr</code></em> is
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn an IPv4
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn address in dotted-decimal notation, or a colon-delimited IPv6 address.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn When this option is used, there is no need to provide the
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>name</code></em>, <em class="parameter"><code>class</code></em> and
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <em class="parameter"><code>type</code></em> arguments. <span><strong class="command">dig</strong></span>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn automatically performs a lookup for a name like
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn <code class="literal">11.12.13.10.in-addr.arpa</code> and sets the
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn query type and
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn class to PTR and IN respectively. By default, IPv6 addresses are
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn looked up using nibble format under the IP6.ARPA domain.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn To use the older RFC1886 method using the IP6.INT domain
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn specify the <code class="option">-i</code> option. Bit string labels (RFC2874)
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn are now experimental and are not attempted.
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn </p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn<p>
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn To sign the DNS queries sent by <span><strong class="command">dig</strong></span> and
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn their
198b363fff1de9afcee2f26b9aa847316f589afeSerge Hallyn responses using transaction signatures (TSIG), specify a TSIG key file
using the <code class="option">-k</code> option. You can also specify the TSIG
key itself on the command line using the <code class="option">-y</code> option;
<em class="parameter"><code>name</code></em> is the name of the TSIG key and
<em class="parameter"><code>key</code></em> is the actual key. The key is a
base-64
encoded string, typically generated by
<span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>.
Caution should be taken when using the <code class="option">-y</code> option on
multi-user systems as the key can be visible in the output from
<span class="citerefentry"><span class="refentrytitle">ps</span>(1)</span>
or in the shell's history file. When
using TSIG authentication with <span><strong class="command">dig</strong></span>, the name
server that is queried needs to know the key and algorithm that is
being used. In BIND, this is done by providing appropriate
<span><strong class="command">key</strong></span> and <span><strong class="command">server</strong></span> statements in
<code class="filename">named.conf</code>.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2545297"></a><h2>QUERY OPTIONS</h2>
<p><span><strong class="command">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>.
The query options are:
</p>
<div class="variablelist"><dl>
<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
behaviour is to use UDP unless an AXFR or IXFR query is
requested, in
which case a TCP connection is used.
</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]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">+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><strong class="command">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">+[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></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]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]aaonly</code></span></dt>
<dd><p>
Sets the "aa" flag in the query.
</p></dd>
<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]adflag</code></span></dt>
<dd><p>
Set [do not set] the AD (authentic data) bit in the query. The
AD bit
currently has a standard meaning only in responses, not in
queries,
but the ability to set the bit in the query is provided for
completeness.
</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]cl</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]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]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><strong class="command">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">+[no]nssearch</code></span></dt>
<dd><p>
When this option is set, <span><strong class="command">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]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><strong class="command">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></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><strong class="command">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]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]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]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]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
behaviour is
to print the query statistics.
</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]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]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]all</code></span></dt>
<dd><p>
Set or clear all display flags.
</p></dd>
<dt><span class="term"><code class="option">+time=T</code></span></dt>
<dd><p>
Sets the timeout for a query to
<em class="parameter"><code>T</code></em> seconds. The default time
out 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">+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">+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">+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>.
</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">+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.
</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><strong class="command">dig</strong></span> output.
</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
behaviour.
</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">+[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">+[no]sigchase</code></span></dt>
<dd><p>
Chase DNSSEC signature chains. Requires dig be compiled with
-DDIG_SIGCHASE.
</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><strong class="command">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.
</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.
</p></dd>
</dl></div>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2626974"></a><h2>MULTIPLE QUERIES</h2>
<p>
The BIND 9 implementation of <span><strong class="command">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><strong class="command">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><strong class="command">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><strong class="command">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="refsect1" lang="en">
<a name="id2627060"></a><h2>IDN SUPPORT</h2>
<p>
If <span><strong class="command">dig</strong></span> has been built with IDN (internationalized
domain name) support, it can accept and display non-ASCII domain names.
<span><strong class="command">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><strong class="command">dig</strong></span> runs.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2627089"></a><h2>FILES</h2>
<p><code class="filename">/etc/resolv.conf</code>
</p>
<p><code class="filename">${HOME}/.digrc</code>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2627110"></a><h2>SEE ALSO</h2>
<p><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="refsect1" lang="en">
<a name="id2627147"></a><h2>BUGS</h2>
<p>
There are probably too many query options.
</p>
</div>
</div>
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