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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!-- - Copyright (C) 2000-2021 Internet Systems Consortium, Inc. ("ISC") - - This Source Code Form is subject to the terms of the Mozilla Public - License, v. 2.0. If a copy of the MPL was not distributed with this - file, You can obtain one at http://mozilla.org/MPL/2.0/. --> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>nslookup</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual"> <link rel="up" href="Bv9ARM.ch13.html" title="Manual pages"> <link rel="prev" href="man.nsec3hash.html" title="nsec3hash"> <link rel="next" href="man.nsupdate.html" title="nsupdate"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr><th colspan="3" align="center">nslookup</th></tr> <tr> <td width="20%" align="left"> <a accesskey="p" href="man.nsec3hash.html">Prev</a>�</td> <th width="60%" align="center">Manual pages</th> <td width="20%" align="right">�<a accesskey="n" href="man.nsupdate.html">Next</a> </td> </tr> </table> <hr> </div> <div class="refentry"> <a name="man.nslookup"></a><div class="titlepage"></div> <div class="refnamediv"> <h2>Name</h2> <p>nslookup &#8212; query Internet name servers interactively</p> </div> <div class="refsynopsisdiv"> <h2>Synopsis</h2> <div class="cmdsynopsis"><p><code class="command">nslookup</code> [<code class="option">-option</code>] [name | -] [server]</p></div> </div> <div class="refsection"> <a name="id-1.14.31.7"></a><h2>DESCRIPTION</h2> <p><span class="command"><strong>Nslookup</strong></span> is a program to query Internet domain name servers. <span class="command"><strong>Nslookup</strong></span> has two modes: interactive and non-interactive. Interactive mode allows the user to query name servers for information about various hosts and domains or to print a list of hosts in a domain. Non-interactive mode is used to print just the name and requested information for a host or domain. </p> </div> <div class="refsection"> <a name="id-1.14.31.8"></a><h2>ARGUMENTS</h2> <p> Interactive mode is entered in the following cases: </p> <div class="orderedlist"><ol class="orderedlist" type="a"> <li class="listitem"><p> when no arguments are given (the default name server will be used) </p></li> <li class="listitem"><p> when the first argument is a hyphen (-) and the second argument is the host name or Internet address of a name server. </p></li> </ol></div> <p> </p> <p> Non-interactive mode is used when the name or Internet address of the host to be looked up is given as the first argument. The optional second argument specifies the host name or address of a name server. </p> <p> Options can also be specified on the command line if they precede the arguments and are prefixed with a hyphen. For example, to change the default query type to host information, and the initial timeout to 10 seconds, type: </p> <pre class="programlisting"> nslookup -query=hinfo -timeout=10 </pre> <p> </p> <p> The <code class="option">-version</code> option causes <span class="command"><strong>nslookup</strong></span> to print the version number and immediately exits. </p> </div> <div class="refsection"> <a name="id-1.14.31.9"></a><h2>INTERACTIVE COMMANDS</h2> <div class="variablelist"><dl class="variablelist"> <dt><span class="term"><code class="constant">host</code> [<span class="optional">server</span>]</span></dt> <dd> <p> Look up information for host using the current default server or using server, if specified. If host is an Internet address and the query type is A or PTR, the name of the host is returned. If host is a name and does not have a trailing period, the search list is used to qualify the name. </p> <p> To look up a host not in the current domain, append a period to the name. </p> </dd> <dt><span class="term"><code class="constant">server</code> <em class="replaceable"><code>domain</code></em></span></dt> <dd><p></p></dd> <dt><span class="term"><code class="constant">lserver</code> <em class="replaceable"><code>domain</code></em></span></dt> <dd><p> Change the default server to <em class="replaceable"><code>domain</code></em>; <code class="constant">lserver</code> uses the initial server to look up information about <em class="replaceable"><code>domain</code></em>, while <code class="constant">server</code> uses the current default server. If an authoritative answer can't be found, the names of servers that might have the answer are returned. </p></dd> <dt><span class="term"><code class="constant">root</code></span></dt> <dd><p> not implemented </p></dd> <dt><span class="term"><code class="constant">finger</code></span></dt> <dd><p> not implemented </p></dd> <dt><span class="term"><code class="constant">ls</code></span></dt> <dd><p> not implemented </p></dd> <dt><span class="term"><code class="constant">view</code></span></dt> <dd><p> not implemented </p></dd> <dt><span class="term"><code class="constant">help</code></span></dt> <dd><p> not implemented </p></dd> <dt><span class="term"><code class="constant">?</code></span></dt> <dd><p> not implemented </p></dd> <dt><span class="term"><code class="constant">exit</code></span></dt> <dd><p> Exits the program. </p></dd> <dt><span class="term"><code class="constant">set</code> <em class="replaceable"><code>keyword[<span class="optional">=value</span>]</code></em></span></dt> <dd> <p> This command is used to change state information that affects the lookups. Valid keywords are: </p> <div class="variablelist"><dl class="variablelist"> <dt><span class="term"><code class="constant">all</code></span></dt> <dd><p> Prints the current values of the frequently used options to <span class="command"><strong>set</strong></span>. Information about the current default server and host is also printed. </p></dd> <dt><span class="term"><code class="constant">class=</code><em class="replaceable"><code>value</code></em></span></dt> <dd> <p> Change the query class to one of: </p> <div class="variablelist"><dl class="variablelist"> <dt><span class="term"><code class="constant">IN</code></span></dt> <dd><p> the Internet class </p></dd> <dt><span class="term"><code class="constant">CH</code></span></dt> <dd><p> the Chaos class </p></dd> <dt><span class="term"><code class="constant">HS</code></span></dt> <dd><p> the Hesiod class </p></dd> <dt><span class="term"><code class="constant">ANY</code></span></dt> <dd><p> wildcard </p></dd> </dl></div> <p> The class specifies the protocol group of the information. </p> <p> (Default = IN; abbreviation = cl) </p> </dd> <dt><span class="term"><code class="constant"><em class="replaceable"><code>[<span class="optional">no</span>]</code></em>debug</code></span></dt> <dd> <p> Turn on or off the display of the full response packet and any intermediate response packets when searching. </p> <p> (Default = nodebug; abbreviation = [<span class="optional">no</span>]deb) </p> </dd> <dt><span class="term"><code class="constant"><em class="replaceable"><code>[<span class="optional">no</span>]</code></em>d2</code></span></dt> <dd> <p> Turn debugging mode on or off. This displays more about what nslookup is doing. </p> <p> (Default = nod2) </p> </dd> <dt><span class="term"><code class="constant">domain=</code><em class="replaceable"><code>name</code></em></span></dt> <dd><p> Sets the search list to <em class="replaceable"><code>name</code></em>. </p></dd> <dt><span class="term"><code class="constant"><em class="replaceable"><code>[<span class="optional">no</span>]</code></em>search</code></span></dt> <dd> <p> If the lookup request contains at least one period but doesn't end with a trailing period, append the domain names in the domain search list to the request until an answer is received. </p> <p> (Default = search) </p> </dd> <dt><span class="term"><code class="constant">port=</code><em class="replaceable"><code>value</code></em></span></dt> <dd> <p> Change the default TCP/UDP name server port to <em class="replaceable"><code>value</code></em>. </p> <p> (Default = 53; abbreviation = po) </p> </dd> <dt><span class="term"><code class="constant">querytype=</code><em class="replaceable"><code>value</code></em></span></dt> <dd><p></p></dd> <dt><span class="term"><code class="constant">type=</code><em class="replaceable"><code>value</code></em></span></dt> <dd> <p> Change the type of the information query. </p> <p> (Default = A and then AAAA; abbreviations = q, ty) </p> <p> <span class="bold"><strong>Note:</strong></span> It is only possible to specify one query type, only the default behavior looks up both when an alternative is not specified. </p> </dd> <dt><span class="term"><code class="constant"><em class="replaceable"><code>[<span class="optional">no</span>]</code></em>recurse</code></span></dt> <dd> <p> Tell the name server to query other servers if it does not have the information. </p> <p> (Default = recurse; abbreviation = [no]rec) </p> </dd> <dt><span class="term"><code class="constant">ndots=</code><em class="replaceable"><code>number</code></em></span></dt> <dd><p> Set the number of dots (label separators) in a domain that will disable searching. Absolute names always stop searching. </p></dd> <dt><span class="term"><code class="constant">retry=</code><em class="replaceable"><code>number</code></em></span></dt> <dd><p> Set the number of retries to number. </p></dd> <dt><span class="term"><code class="constant">timeout=</code><em class="replaceable"><code>number</code></em></span></dt> <dd><p> Change the initial timeout interval for waiting for a reply to number seconds. </p></dd> <dt><span class="term"><code class="constant"><em class="replaceable"><code>[<span class="optional">no</span>]</code></em>vc</code></span></dt> <dd> <p> Always use a virtual circuit when sending requests to the server. </p> <p> (Default = novc) </p> </dd> <dt><span class="term"><code class="constant"><em class="replaceable"><code>[<span class="optional">no</span>]</code></em>fail</code></span></dt> <dd> <p> Try the next nameserver if a nameserver responds with SERVFAIL or a referral (nofail) or terminate query (fail) on such a response. </p> <p> (Default = nofail) </p> </dd> </dl></div> <p> </p> </dd> </dl></div> </div> <div class="refsection"> <a name="id-1.14.31.10"></a><h2>RETURN VALUES</h2> <p> <span class="command"><strong>nslookup</strong></span> returns with an exit status of 1 if any query failed, and 0 otherwise. </p> </div> <div class="refsection"> <a name="id-1.14.31.11"></a><h2>IDN SUPPORT</h2> <p> If <span class="command"><strong>nslookup</strong></span> has been built with IDN (internationalized domain name) support, it can accept and display non-ASCII domain names. <span class="command"><strong>nslookup</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, define the <code class="envar">IDN_DISABLE</code> environment variable. The IDN support is disabled if the variable is set when <span class="command"><strong>nslookup</strong></span> runs or when the standard output is not a tty. </p> </div> <div class="refsection"> <a name="id-1.14.31.12"></a><h2>FILES</h2> <p><code class="filename">/etc/resolv.conf</code> </p> </div> <div class="refsection"> <a name="id-1.14.31.13"></a><h2>SEE ALSO</h2> <p><span class="citerefentry"><span class="refentrytitle">dig</span>(1)</span>, <span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>, <span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>. </p> </div> </div> <div class="navfooter"> <hr> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"> <a accesskey="p" href="man.nsec3hash.html">Prev</a>�</td> <td width="20%" align="center"><a accesskey="u" href="Bv9ARM.ch13.html">Up</a></td> <td width="40%" align="right">�<a accesskey="n" href="man.nsupdate.html">Next</a> </td> </tr> <tr> <td width="40%" align="left" valign="top"> <span class="application">nsec3hash</span>�</td> <td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td> <td width="40%" align="right" valign="top">�<span class="application">nsupdate</span> </td> </tr> </table> </div> <p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.11.36 (Extended Support Version)</p> </body> </html>
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