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7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<title>nslookup</title>
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7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<a name="id2456699"></a><div class="titlepage"></div>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<div class="refnamediv">
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<h2>Name</h2>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<p>nslookup &#8212; query Internet name servers interactively</p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego</div>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<div class="refsynopsisdiv">
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<h2>Synopsis</h2>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<div class="cmdsynopsis"><p><code class="command">nslookup</code> [<code class="option">-option</code>] [name | -] [server]</p></div>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego</div>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<div class="refsect1" lang="en">
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<a name="id2514106"></a><h2>DESCRIPTION</h2>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<p><span><strong class="command">Nslookup</strong></span>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego is a program to query Internet domain name servers. <span><strong class="command">Nslookup</strong></span>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego has two modes: interactive and non-interactive. Interactive mode allows
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego the user to query name servers for information about various hosts and
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego domains or to print a list of hosts in a domain. Non-interactive mode
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego is
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego used to print just the name and requested information for a host or
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego domain.
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego</div>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<div class="refsect1" lang="en">
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<a name="id2514122"></a><h2>ARGUMENTS</h2>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego Interactive mode is entered in the following cases:
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<div class="orderedlist"><ol type="a">
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<li><p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego when no arguments are given (the default name server will be used)
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p></li>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<li><p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego when the first argument is a hyphen (-) and the second argument is
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego the host name or Internet address of a name server.
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p></li>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego</ol></div>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego Non-interactive mode is used when the name or Internet address of the
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego host to be looked up is given as the first argument. The optional second
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego argument specifies the host name or address of a name server.
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego<p>
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego Options can also be specified on the command line if they precede the
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego arguments and are prefixed with a hyphen. For example, to
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego change the default query type to host information, and the initial
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego timeout to 10 seconds, type:
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego </p>
<div class="informalexample"><pre class="programlisting">
nslookup -query=hinfo -timeout=10
</pre></div>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2514164"></a><h2>INTERACTIVE COMMANDS</h2>
<div class="variablelist"><dl>
<dt><span class="term">host [<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>
<dt><span class="term"><code class="constant">all</code></span></dt>
<dd><p>
Prints the current values of the frequently used
options to <span><strong class="command">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>
<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 debugging mode on. A lot more information is
printed about the packet sent to the server and the
resulting answer.
</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. A lot more information is
printed about the packet sent to the server and the
resulting answer.
</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 top of the information query.
</p>
<p>
(Default = A; abbreviations = q, ty)
</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">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>
</dl></div>
<p>
</p>
</dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
<a name="id2514753"></a><h2>FILES</h2>
<p><code class="filename">/etc/resolv.conf</code>
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2514764"></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 class="refsect1" lang="en">
<a name="id2514798"></a><h2>Author</h2>
<p>
Andrew Cherenson
</p>
</div>
</div></body>
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