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04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refentry">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="man.nslookup"></a><div class="titlepage"></div>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refnamediv">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<p>nslookup — query Internet name servers interactively</p>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsynopsisdiv">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<h2>Synopsis</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="cmdsynopsis"><p><code class="command">nslookup</code> [<code class="option">-option</code>] [name | -] [server]</p></div>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsection">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="id-1.14.6.7"></a><h2>DESCRIPTION</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<p><span class="command"><strong>Nslookup</strong></span>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China is a program to query Internet domain name servers. <span class="command"><strong>Nslookup</strong></span>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China has two modes: interactive and non-interactive. Interactive mode allows
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the user to query name servers for information about various hosts and
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China domains or to print a list of hosts in a domain. Non-interactive mode
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China used to print just the name and requested information for a host or
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsection">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="id-1.14.6.8"></a><h2>ARGUMENTS</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Interactive mode is entered in the following cases:
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="orderedlist"><ol class="orderedlist" type="a">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<li class="listitem"><p>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China when no arguments are given (the default name server will be used)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<li class="listitem"><p>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China when the first argument is a hyphen (-) and the second argument is
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the host name or Internet address of a name server.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Non-interactive mode is used when the name or Internet address of the
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China host to be looked up is given as the first argument. The optional second
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China argument specifies the host name or address of a name server.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Options can also be specified on the command line if they precede the
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China arguments and are prefixed with a hyphen. For example, to
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China change the default query type to host information, and the initial
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China timeout to 10 seconds, type:
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<pre class="programlisting">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing Chinanslookup -query=hinfo -timeout=10
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China The <code class="option">-version</code> option causes
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <span class="command"><strong>nslookup</strong></span> to print the version
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China number and immediately exits.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsection">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="id-1.14.6.9"></a><h2>INTERACTIVE COMMANDS</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="variablelist"><dl class="variablelist">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">host</code> [<span class="optional">server</span>]</span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Look up information for host using the current default server or
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China using server, if specified. If host is an Internet address and
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the query type is A or PTR, the name of the host is returned.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China If host is a name and does not have a trailing period, the
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China search list is used to qualify the name.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China To look up a host not in the current domain, append a period to
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">server</code> <em class="replaceable"><code>domain</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dd><p></p></dd>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">lserver</code> <em class="replaceable"><code>domain</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Change the default server to <em class="replaceable"><code>domain</code></em>; <code class="constant">lserver</code> uses the initial
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China server to look up information about <em class="replaceable"><code>domain</code></em>, while <code class="constant">server</code> uses
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the current default server. If an authoritative answer can't be
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China found, the names of servers that might have the answer are
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">root</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China not implemented
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">finger</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China not implemented
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">ls</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China not implemented
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">view</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China not implemented
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">help</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China not implemented
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">?</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China not implemented
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">exit</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Exits the program.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">set</code>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <em class="replaceable"><code>keyword[<span class="optional">=value</span>]</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China This command is used to change state information that affects
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the lookups. Valid keywords are:
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="variablelist"><dl class="variablelist">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">all</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Prints the current values of the frequently used
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China options to <span class="command"><strong>set</strong></span>.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Information about the current default
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China server and host is also printed.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">class=</code><em class="replaceable"><code>value</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Change the query class to one of:
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="variablelist"><dl class="variablelist">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">IN</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the Internet class
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">CH</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the Chaos class
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">HS</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China the Hesiod class
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">ANY</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China The class specifies the protocol group of the information.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = IN; abbreviation = cl)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>debug</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Turn on or off the display of the full response packet and
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China any intermediate response packets when searching.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = nodebug; abbreviation = [<span class="optional">no</span>]deb)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>d2</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Turn debugging mode on or off. This displays more about
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China what nslookup is doing.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = nod2)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">domain=</code><em class="replaceable"><code>name</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Sets the search list to <em class="replaceable"><code>name</code></em>.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>search</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China If the lookup request contains at least one period but
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China doesn't end with a trailing period, append the domain
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China names in the domain search list to the request until an
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China answer is received.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = search)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">port=</code><em class="replaceable"><code>value</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Change the default TCP/UDP name server port to <em class="replaceable"><code>value</code></em>.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = 53; abbreviation = po)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">querytype=</code><em class="replaceable"><code>value</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dd><p></p></dd>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">type=</code><em class="replaceable"><code>value</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Change the type of the information query.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = A; abbreviations = q, ty)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>recurse</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Tell the name server to query other servers if it does not
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = recurse; abbreviation = [no]rec)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">ndots=</code><em class="replaceable"><code>number</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Set the number of dots (label separators) in a domain
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China that will disable searching. Absolute names always
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China stop searching.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">retry=</code><em class="replaceable"><code>number</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Set the number of retries to number.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">timeout=</code><em class="replaceable"><code>number</code></em></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Change the initial timeout interval for waiting for a
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China reply to number seconds.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>vc</code></span></dt>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China Always use a virtual circuit when sending requests to the
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = novc)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<dt><span class="term"><code class="constant">
1a5e258f5471356ca102c7176637cdce45bac147Josef 'Jeff' Sipek <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>fail</code></span></dt>
1a5e258f5471356ca102c7176637cdce45bac147Josef 'Jeff' Sipek Try the next nameserver if a nameserver responds with
1a5e258f5471356ca102c7176637cdce45bac147Josef 'Jeff' Sipek SERVFAIL or a referral (nofail) or terminate query
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (fail) on such a response.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China (Default = nofail)
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsection">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="id-1.14.6.10"></a><h2>RETURN VALUES</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <span class="command"><strong>nslookup</strong></span> returns with an exit status of 1
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China if any query failed, and 0 otherwise.
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsection">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="id-1.14.6.11"></a><h2>FILES</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<p><code class="filename">/etc/resolv.conf</code>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<div class="refsection">
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<a name="id-1.14.6.12"></a><h2>SEE ALSO</h2>
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China<p><span class="citerefentry"><span class="refentrytitle">dig</span>(1)</span>,
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>,
04b6cca3fef9f6205a9aa479c48d196116193dd9lucy wang - Sun Microsystems - Beijing China <span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>.
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