man.dig.html revision 29651c3a80835482fa1612c24653c9b0c0e2e205
0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer - Copyright (C) 2004-2012 Internet Systems Consortium, Inc. ("ISC")
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - Copyright (C) 2000-2003 Internet Software Consortium.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - Permission to use, copy, modify, and/or distribute this software for any
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - purpose with or without fee is hereby granted, provided that the above
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - copyright notice and this permission notice appear in all copies.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang - PERFORMANCE OF THIS SOFTWARE.
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22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<a name="man.dig"></a><div class="titlepage"></div>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<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">-m</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>[<span class="optional">hmac:</span>]name:key</code></em></code>] [<code class="option">-4</code>] [<code class="option">-6</code>] [name] [type] [class] [queryopt...]</p></div>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<div class="cmdsynopsis"><p><code class="command">dig</code> [<code class="option">-h</code>]</p></div>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<div class="cmdsynopsis"><p><code class="command">dig</code> [global-queryopt...] [query...]</p></div>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<p><span><strong class="command">dig</strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang (domain information groper) is a flexible tool
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang for interrogating DNS name servers. It performs DNS lookups and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang displays the answers that are returned from the name server(s) that
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang were queried. Most DNS administrators use <span><strong class="command">dig</strong></span> to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang troubleshoot DNS problems because of its flexibility, ease of use and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang clarity of output. Other lookup tools tend to have less functionality
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang than <span><strong class="command">dig</strong></span>.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Although <span><strong class="command">dig</strong></span> is normally used with
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang command-line
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang arguments, it also has a batch mode of operation for reading lookup
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang requests from a file. A brief summary of its command-line arguments
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang and options is printed when the <code class="option">-h</code> option is given.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Unlike earlier versions, the BIND 9 implementation of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> allows multiple lookups to be issued
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang command line.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Unless it is told to query a specific name server,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> will try each of the servers listed
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang When no command line arguments or options are given,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> will perform an NS query for "." (the root).
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang It is possible to set per-user defaults for <span><strong class="command">dig</strong></span> via
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="filename">${HOME}/.digrc</code>. This file is read and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang any options in it
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang are applied before the command line arguments.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The IN and CH class names overlap with the IN and CH top level
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang domains names. Either use the <code class="option">-t</code> and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">-c</code> options to specify the type and class,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang use the <code class="option">-q</code> the specify the domain name, or
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang use "IN." and "CH." when looking up these top level domains.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang A typical invocation of <span><strong class="command">dig</strong></span> looks like:
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<pre class="programlisting"> dig @server name type </pre>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="constant">server</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang is the name or IP address of the name server to query. This can
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang address in dotted-decimal notation or an IPv6
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang address in colon-delimited notation. When the supplied
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>server</code></em> argument is a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> resolves that name before
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang querying that name
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang server. If no <em class="parameter"><code>server</code></em>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang argument is provided,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> consults <code class="filename">/etc/resolv.conf</code>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang and queries the name servers listed there. The reply from the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang server that responds is displayed.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="constant">name</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang is the name of the resource record that is to be looked up.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="constant">type</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang indicates what type of query is required —
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang ANY, A, MX, SIG, etc.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>type</code></em> can be any valid query
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>type</code></em> argument is supplied,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> will perform a lookup for an
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The <code class="option">-b</code> option sets the source IP address of the query
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang to <em class="parameter"><code>address</code></em>. This must be a valid
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang one of the host's network interfaces or "0.0.0.0" or "::". An optional
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang may be specified by appending "#<port>"
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The default query class (IN for internet) is overridden by the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">-c</code> option. <em class="parameter"><code>class</code></em> is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang class, such as HS for Hesiod records or CH for Chaosnet records.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The <code class="option">-f</code> option makes <span><strong class="command">dig </strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang in batch mode by reading a list of lookup requests to process from the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang file <em class="parameter"><code>filename</code></em>. The file contains a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang queries, one per line. Each entry in the file should be organized in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the same way they would be presented as queries to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> using the command-line interface.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The <code class="option">-m</code> option enables memory usage debugging.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang If a non-standard port number is to be queried, the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">-p</code> option is used. <em class="parameter"><code>port#</code></em> is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the port number that <span><strong class="command">dig</strong></span> will send its
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang instead of the standard DNS port number 53. This option would be used
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang to test a name server that has been configured to listen for queries
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang on a non-standard port number.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The <code class="option">-4</code> option forces <span><strong class="command">dig</strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang use IPv4 query transport. The <code class="option">-6</code> option forces
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> to only use IPv6 query transport.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The <code class="option">-t</code> option sets the query type to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>type</code></em>. It can be any valid query type
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang supported in BIND 9. The default query type is "A", unless the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">-x</code> option is supplied to indicate a reverse lookup.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang A zone transfer can be requested by specifying a type of AXFR. When
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang an incremental zone transfer (IXFR) is required,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>type</code></em> is set to <code class="literal">ixfr=N</code>.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The incremental zone transfer will contain the changes made to the zone
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang since the serial number in the zone's SOA record was
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The <code class="option">-q</code> option sets the query name to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>name</code></em>. This useful do distinguish the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>name</code></em> from other arguments.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Reverse lookups — mapping addresses to names — are simplified by the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">-x</code> option. <em class="parameter"><code>addr</code></em> is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang address in dotted-decimal notation, or a colon-delimited IPv6 address.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang When this option is used, there is no need to provide the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>name</code></em>, <em class="parameter"><code>class</code></em> and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>type</code></em> arguments. <span><strong class="command">dig</strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang automatically performs a lookup for a name like
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="literal">11.12.13.10.in-addr.arpa</code> and sets the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang query type and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang class to PTR and IN respectively. By default, IPv6 addresses are
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang looked up using nibble format under the IP6.ARPA domain.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang To use the older RFC1886 method using the IP6.INT domain
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang specify the <code class="option">-i</code> option. Bit string labels (RFC2874)
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang are now experimental and are not attempted.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang To sign the DNS queries sent by <span><strong class="command">dig</strong></span> and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang responses using transaction signatures (TSIG), specify a TSIG key file
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang using the <code class="option">-k</code> option. You can also specify the TSIG
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang key itself on the command line using the <code class="option">-y</code> option;
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>hmac</code></em> is the type of the TSIG, default HMAC-MD5,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>name</code></em> is the name of the TSIG key and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>key</code></em> is the actual key. The key is a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang encoded string, typically generated by
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Caution should be taken when using the <code class="option">-y</code> option on
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang multi-user systems as the key can be visible in the output from
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span class="citerefentry"><span class="refentrytitle">ps</span>(1)</span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang or in the shell's history file. When
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang using TSIG authentication with <span><strong class="command">dig</strong></span>, the name
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang server that is queried needs to know the key and algorithm that is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang being used. In BIND, this is done by providing appropriate
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">key</strong></span> and <span><strong class="command">server</strong></span> statements in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<p><span><strong class="command">dig</strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang provides a number of query options which affect
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the way in which lookups are made and the results displayed. Some of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang these set or reset flag bits in the query header, some determine which
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang sections of the answer get printed, and others determine the timeout
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang and retry strategies.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Each query option is identified by a keyword preceded by a plus sign
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang (<code class="literal">+</code>). Some keywords set or reset an
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang option. These may be preceded
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang by the string <code class="literal">no</code> to negate the meaning of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang that keyword. Other
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang keywords assign values to options like the timeout interval. They
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang have the form <code class="option">+keyword=value</code>.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The query options are:
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]tcp</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Use [do not use] TCP when querying name servers. The default
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang behavior is to use UDP unless an AXFR or IXFR query is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang requested, in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang which case a TCP connection is used.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]vc</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Use [do not use] TCP when querying name servers. This alternate
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang syntax to <em class="parameter"><code>+[no]tcp</code></em> is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang provided for backwards
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang compatibility. The "vc" stands for "virtual circuit".
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]ignore</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Ignore truncation in UDP responses instead of retrying with TCP.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang default, TCP retries are performed.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+domain=somename</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Set the search list to contain the single domain
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>somename</code></em>, as if specified in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">domain</strong></span> directive in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="filename">/etc/resolv.conf</code>, and enable
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang processing as if the <em class="parameter"><code>+search</code></em>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang option were given.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]search</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Use [do not use] the search list defined by the searchlist or
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang directive in <code class="filename">resolv.conf</code> (if
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The search list is not used by default.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]showsearch</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Perform [do not perform] a search showing intermediate
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]defname</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Deprecated, treated as a synonym for <em class="parameter"><code>+[no]search</code></em>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]aaonly</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Sets the "aa" flag in the query.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]aaflag</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang A synonym for <em class="parameter"><code>+[no]aaonly</code></em>.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]adflag</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Set [do not set] the AD (authentic data) bit in the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang query. This requests the server to return whether
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang all of the answer and authority sections have all
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang been validated as secure according to the security
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang policy of the server. AD=1 indicates that all records
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang have been validated as secure and the answer is not
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang from a OPT-OUT range. AD=0 indicate that some part
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang of the answer was insecure or not validated. This
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang bit is set by default.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]cdflag</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Set [do not set] the CD (checking disabled) bit in the query.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang requests the server to not perform DNSSEC validation of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]cl</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Display [do not display] the CLASS when printing the record.
0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer<dt><span class="term"><code class="option">+[no]ttlid</code></span></dt>
0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer Display [do not display] the TTL when printing the record.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]recurse</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Toggle the setting of the RD (recursion desired) bit
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang in the query. This bit is set by default, which means
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> normally sends recursive
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang queries. Recursion is automatically disabled when
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the <em class="parameter"><code>+nssearch</code></em> or
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>+trace</code></em> query options are used.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]nssearch</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang When this option is set, <span><strong class="command">dig</strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang attempts to find the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang authoritative name servers for the zone containing the name
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang looked up and display the SOA record that each name server has
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]trace</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Toggle tracing of the delegation path from the root
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang name servers for the name being looked up. Tracing
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang is disabled by default. When tracing is enabled,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> makes iterative queries to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang resolve the name being looked up. It will follow
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang referrals from the root servers, showing the answer
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang from each server that was used to resolve the lookup.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">+dnssec</strong></span> is also set when +trace is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang set to better emulate the default queries from a nameserver.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]cmd</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Toggles the printing of the initial comment in the output
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the version of <span><strong class="command">dig</strong></span> and the query
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang options that have
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang been applied. This comment is printed by default.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]short</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Provide a terse answer. The default is to print the answer in a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang verbose form.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]identify</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Show [or do not show] the IP address and port number that
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang supplied the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang answer when the <em class="parameter"><code>+short</code></em> option
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang is enabled. If
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang short form answers are requested, the default is not to show the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang source address and port number of the server that provided the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]comments</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Toggle the display of comment lines in the output. The default
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang is to print comments.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]rrcomments</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Toggle the display of per-record comments in the output (for
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang example, human-readable key information about DNSKEY records).
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The default is not to print record comments unless multiline
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang mode is active.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+split=W</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Split long hex- or base64-formatted fields in resource
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang records into chunks of <em class="parameter"><code>W</code></em> characters
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang (where <em class="parameter"><code>W</code></em> is rounded up to the nearest
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang multiple of 4).
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>+nosplit</code></em> or
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>+split=0</code></em> causes fields not to be
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang split at all. The default is 56 characters, or 44 characters
0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer when multiline mode is active.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]stats</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang This query option toggles the printing of statistics: when the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang was made, the size of the reply and so on. The default
0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer to print the query statistics.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]qr</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Print [do not print] the query as it is sent.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang By default, the query is not printed.
0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer<dt><span class="term"><code class="option">+[no]question</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Print [do not print] the question section of a query when an
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang returned. The default is to print the question section as a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]answer</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Display [do not display] the answer section of a reply. The
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang is to display it.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]authority</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Display [do not display] the authority section of a reply. The
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang default is to display it.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]additional</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Display [do not display] the additional section of a reply.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The default is to display it.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]all</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Set or clear all display flags.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+time=T</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Sets the timeout for a query to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>T</code></em> seconds. The default
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang timeout is 5 seconds.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang An attempt to set <em class="parameter"><code>T</code></em> to less
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang than 1 will result
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang in a query timeout of 1 second being applied.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+tries=T</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Sets the number of times to try UDP queries to server to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>T</code></em> instead of the default, 3.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>T</code></em> is less than or equal to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang zero, the number of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang tries is silently rounded up to 1.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+retry=T</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Sets the number of times to retry UDP queries to server to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>T</code></em> instead of the default, 2.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>+tries</code></em>, this does not include
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+ndots=D</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Set the number of dots that have to appear in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>name</code></em> to <em class="parameter"><code>D</code></em> for it to be
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang considered absolute. The default value is that defined using
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang ndots statement in <code class="filename">/etc/resolv.conf</code>, or 1 if no
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang ndots statement is present. Names with fewer dots are
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang interpreted as
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang relative names and will be searched for in the domains listed in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">search</code> or <code class="option">domain</code> directive in
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+bufsize=B</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Set the UDP message buffer size advertised using EDNS0 to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>B</code></em> bytes. The maximum and minimum sizes
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang of this buffer are 65535 and 0 respectively. Values outside
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang this range are rounded up or down appropriately.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Values other than zero will cause a EDNS query to be sent.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+edns=#</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Specify the EDNS version to query with. Valid values
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang are 0 to 255. Setting the EDNS version will cause
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang a EDNS query to be sent. <code class="option">+noedns</code>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang clears the remembered EDNS version. EDNS is set to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang 0 by default.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]multiline</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Print records like the SOA records in a verbose multi-line
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang format with human-readable comments. The default is to print
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang each record on a single line, to facilitate machine parsing
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang of the <span><strong class="command">dig</strong></span> output.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]onesoa</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Print only one (starting) SOA record when performing
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang an AXFR. The default is to print both the starting and
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang ending SOA records.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]fail</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Do not try the next server if you receive a SERVFAIL. The
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang to not try the next server which is the reverse of normal stub
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]besteffort</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Attempt to display the contents of messages which are malformed.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The default is to not display malformed answers.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]dnssec</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Requests DNSSEC records be sent by setting the DNSSEC OK bit
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang in the OPT record in the additional section of the query.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]sigchase</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Chase DNSSEC signature chains. Requires dig be compiled with
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang -DDIG_SIGCHASE.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+trusted-key=####</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Specifies a file containing trusted keys to be used with
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="option">+sigchase</code>. Each DNSKEY record must be
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang on its own line.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang If not specified, <span><strong class="command">dig</strong></span> will look for
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="filename">/etc/trusted-key.key</code> then
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <code class="filename">trusted-key.key</code> in the current directory.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Requires dig be compiled with -DDIG_SIGCHASE.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]topdown</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang When chasing DNSSEC signature chains perform a top-down
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Requires dig be compiled with -DDIG_SIGCHASE.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<dt><span class="term"><code class="option">+[no]nsid</code></span></dt>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang Include an EDNS name server ID request when sending a query.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<a name="id2664648"></a><h2>MULTIPLE QUERIES</h2>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The BIND 9 implementation of <span><strong class="command">dig </strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang specifying multiple queries on the command line (in addition to
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang supporting the <code class="option">-f</code> batch file option). Each of those
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang queries can be supplied with its own set of flags, options and query
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang In this case, each <em class="parameter"><code>query</code></em> argument
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang represent an
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang individual query in the command-line syntax described above. Each
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang consists of any of the standard options and flags, the name to be
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang looked up, an optional query type and class and any query options that
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang should be applied to that query.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang A global set of query options, which should be applied to all queries,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang can also be supplied. These global query options must precede the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang first tuple of name, class, type, options, flags, and query options
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang supplied on the command line. Any global query options (except
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the <code class="option">+[no]cmd</code> option) can be
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang overridden by a query-specific set of query options. For example:
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fangdig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang shows how <span><strong class="command">dig</strong></span> could be used from the
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang command line
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang to make three lookups: an ANY query for <code class="literal">www.isc.org</code>, a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang reverse lookup of 127.0.0.1 and a query for the NS records of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang A global query option of <em class="parameter"><code>+qr</code></em> is
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang that <span><strong class="command">dig</strong></span> shows the initial query it made
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang lookup. The final query has a local query option of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <em class="parameter"><code>+noqr</code></em> which means that <span><strong class="command">dig</strong></span>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang will not print the initial query when it looks up the NS records for
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang If <span><strong class="command">dig</strong></span> has been built with IDN (internationalized
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang domain name) support, it can accept and display non-ASCII domain names.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> appropriately converts character encoding of
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang domain name before sending a request to DNS server or displaying a
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang reply from the server.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang If you'd like to turn off the IDN support for some reason, defines
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang the <code class="envar">IDN_DISABLE</code> environment variable.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang The IDN support is disabled if the variable is set when
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span><strong class="command">dig</strong></span> runs.
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<p><code class="filename">/etc/resolv.conf</code>
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang<p><span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang <span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>,
22a84b8d79248a611e4ba663a268d3c4bed054acQuaker Fang There are probably too many query options.
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