1<!-- 2 - Copyright (C) 2004-2007, 2010, 2013, 2014 Internet Systems Consortium, Inc. ("ISC") 3 - 4 - Permission to use, copy, modify, and/or distribute this software for any 5 - purpose with or without fee is hereby granted, provided that the above 6 - copyright notice and this permission notice appear in all copies. 7 - 8 - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 9 - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 10 - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 11 - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 12 - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 13 - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 14 - PERFORMANCE OF THIS SOFTWARE. 15--> 16<!-- Id --> 17<html> 18<head> 19<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 20<title>nslookup</title> 21<meta name="generator" content="DocBook XSL Stylesheets V1.71.1"> 22</head> 23<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"> 24<a name="id2476283"></a><div class="titlepage"></div> 25<div class="refnamediv"> 26<h2>Name</h2> 27<p>nslookup — query Internet name servers interactively</p> 28</div> 29<div class="refsynopsisdiv"> 30<h2>Synopsis</h2> 31<div class="cmdsynopsis"><p><code class="command">nslookup</code> [<code class="option">-option</code>] [name | -] [server]</p></div> 32</div> 33<div class="refsect1" lang="en"> 34<a name="id2543442"></a><h2>DESCRIPTION</h2> 35<p><span><strong class="command">Nslookup</strong></span> 36 is a program to query Internet domain name servers. <span><strong class="command">Nslookup</strong></span> 37 has two modes: interactive and non-interactive. Interactive mode allows 38 the user to query name servers for information about various hosts and 39 domains or to print a list of hosts in a domain. Non-interactive mode 40 is 41 used to print just the name and requested information for a host or 42 domain. 43 </p> 44</div> 45<div class="refsect1" lang="en"> 46<a name="id2543458"></a><h2>ARGUMENTS</h2> 47<p> 48 Interactive mode is entered in the following cases: 49 </p> 50<div class="orderedlist"><ol type="a"> 51<li><p> 52 when no arguments are given (the default name server will be used) 53 </p></li> 54<li><p> 55 when the first argument is a hyphen (-) and the second argument is 56 the host name or Internet address of a name server. 57 </p></li> 58</ol></div> 59<p> 60 </p> 61<p> 62 Non-interactive mode is used when the name or Internet address of the 63 host to be looked up is given as the first argument. The optional second 64 argument specifies the host name or address of a name server. 65 </p> 66<p> 67 Options can also be specified on the command line if they precede the 68 arguments and are prefixed with a hyphen. For example, to 69 change the default query type to host information, and the initial 70 timeout to 10 seconds, type: 71 72 </p> 73<pre class="programlisting"> 74nslookup -query=hinfo -timeout=10 75</pre> 76<p> 77 78 </p> 79<p> 80 The <code class="option">-version</code> option causes 81 <span><strong class="command">nslookup</strong></span> to print the version 82 number and immediately exits. 83 </p> 84</div> 85<div class="refsect1" lang="en"> 86<a name="id2543512"></a><h2>INTERACTIVE COMMANDS</h2> 87<div class="variablelist"><dl> 88<dt><span class="term"><code class="constant">host</code> [<span class="optional">server</span>]</span></dt> 89<dd> 90<p> 91 Look up information for host using the current default server or 92 using server, if specified. If host is an Internet address and 93 the query type is A or PTR, the name of the host is returned. 94 If host is a name and does not have a trailing period, the 95 search list is used to qualify the name. 96 </p> 97<p> 98 To look up a host not in the current domain, append a period to 99 the name. 100 </p> 101</dd> 102<dt><span class="term"><code class="constant">server</code> <em class="replaceable"><code>domain</code></em></span></dt> 103<dd><p></p></dd> 104<dt><span class="term"><code class="constant">lserver</code> <em class="replaceable"><code>domain</code></em></span></dt> 105<dd><p> 106 Change the default server to <em class="replaceable"><code>domain</code></em>; <code class="constant">lserver</code> uses the initial 107 server to look up information about <em class="replaceable"><code>domain</code></em>, while <code class="constant">server</code> uses 108 the current default server. If an authoritative answer can't be 109 found, the names of servers that might have the answer are 110 returned. 111 </p></dd> 112<dt><span class="term"><code class="constant">root</code></span></dt> 113<dd><p> 114 not implemented 115 </p></dd> 116<dt><span class="term"><code class="constant">finger</code></span></dt> 117<dd><p> 118 not implemented 119 </p></dd> 120<dt><span class="term"><code class="constant">ls</code></span></dt> 121<dd><p> 122 not implemented 123 </p></dd> 124<dt><span class="term"><code class="constant">view</code></span></dt> 125<dd><p> 126 not implemented 127 </p></dd> 128<dt><span class="term"><code class="constant">help</code></span></dt> 129<dd><p> 130 not implemented 131 </p></dd> 132<dt><span class="term"><code class="constant">?</code></span></dt> 133<dd><p> 134 not implemented 135 </p></dd> 136<dt><span class="term"><code class="constant">exit</code></span></dt> 137<dd><p> 138 Exits the program. 139 </p></dd> 140<dt><span class="term"><code class="constant">set</code> 141 <em class="replaceable"><code>keyword[<span class="optional">=value</span>]</code></em></span></dt> 142<dd> 143<p> 144 This command is used to change state information that affects 145 the lookups. Valid keywords are: 146 </p> 147<div class="variablelist"><dl> 148<dt><span class="term"><code class="constant">all</code></span></dt> 149<dd><p> 150 Prints the current values of the frequently used 151 options to <span><strong class="command">set</strong></span>. 152 Information about the current default 153 server and host is also printed. 154 </p></dd> 155<dt><span class="term"><code class="constant">class=</code><em class="replaceable"><code>value</code></em></span></dt> 156<dd> 157<p> 158 Change the query class to one of: 159 </p> 160<div class="variablelist"><dl> 161<dt><span class="term"><code class="constant">IN</code></span></dt> 162<dd><p> 163 the Internet class 164 </p></dd> 165<dt><span class="term"><code class="constant">CH</code></span></dt> 166<dd><p> 167 the Chaos class 168 </p></dd> 169<dt><span class="term"><code class="constant">HS</code></span></dt> 170<dd><p> 171 the Hesiod class 172 </p></dd> 173<dt><span class="term"><code class="constant">ANY</code></span></dt> 174<dd><p> 175 wildcard 176 </p></dd> 177</dl></div> 178<p> 179 The class specifies the protocol group of the information. 180 181 </p> 182<p> 183 (Default = IN; abbreviation = cl) 184 </p> 185</dd> 186<dt><span class="term"><code class="constant"> 187 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>debug</code></span></dt> 188<dd> 189<p> 190 Turn on or off the display of the full response packet and 191 any intermediate response packets when searching. 192 </p> 193<p> 194 (Default = nodebug; abbreviation = [<span class="optional">no</span>]deb) 195 </p> 196</dd> 197<dt><span class="term"><code class="constant"> 198 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>d2</code></span></dt> 199<dd> 200<p> 201 Turn debugging mode on or off. This displays more about 202 what nslookup is doing. 203 </p> 204<p> 205 (Default = nod2) 206 </p> 207</dd> 208<dt><span class="term"><code class="constant">domain=</code><em class="replaceable"><code>name</code></em></span></dt> 209<dd><p> 210 Sets the search list to <em class="replaceable"><code>name</code></em>. 211 </p></dd> 212<dt><span class="term"><code class="constant"> 213 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>search</code></span></dt> 214<dd> 215<p> 216 If the lookup request contains at least one period but 217 doesn't end with a trailing period, append the domain 218 names in the domain search list to the request until an 219 answer is received. 220 </p> 221<p> 222 (Default = search) 223 </p> 224</dd> 225<dt><span class="term"><code class="constant">port=</code><em class="replaceable"><code>value</code></em></span></dt> 226<dd> 227<p> 228 Change the default TCP/UDP name server port to <em class="replaceable"><code>value</code></em>. 229 </p> 230<p> 231 (Default = 53; abbreviation = po) 232 </p> 233</dd> 234<dt><span class="term"><code class="constant">querytype=</code><em class="replaceable"><code>value</code></em></span></dt> 235<dd><p></p></dd> 236<dt><span class="term"><code class="constant">type=</code><em class="replaceable"><code>value</code></em></span></dt> 237<dd> 238<p> 239 Change the type of the information query. 240 </p> 241<p> 242 (Default = A; abbreviations = q, ty) 243 </p> 244</dd> 245<dt><span class="term"><code class="constant"> 246 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>recurse</code></span></dt> 247<dd> 248<p> 249 Tell the name server to query other servers if it does not 250 have the 251 information. 252 </p> 253<p> 254 (Default = recurse; abbreviation = [no]rec) 255 </p> 256</dd> 257<dt><span class="term"><code class="constant">ndots=</code><em class="replaceable"><code>number</code></em></span></dt> 258<dd><p> 259 Set the number of dots (label separators) in a domain 260 that will disable searching. Absolute names always 261 stop searching. 262 </p></dd> 263<dt><span class="term"><code class="constant">retry=</code><em class="replaceable"><code>number</code></em></span></dt> 264<dd><p> 265 Set the number of retries to number. 266 </p></dd> 267<dt><span class="term"><code class="constant">timeout=</code><em class="replaceable"><code>number</code></em></span></dt> 268<dd><p> 269 Change the initial timeout interval for waiting for a 270 reply to number seconds. 271 </p></dd> 272<dt><span class="term"><code class="constant"> 273 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>vc</code></span></dt> 274<dd> 275<p> 276 Always use a virtual circuit when sending requests to the 277 server. 278 </p> 279<p> 280 (Default = novc) 281 </p> 282</dd> 283<dt><span class="term"><code class="constant"> 284 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>fail</code></span></dt> 285<dd> 286<p> 287 Try the next nameserver if a nameserver responds with 288 SERVFAIL or a referral (nofail) or terminate query 289 (fail) on such a response. 290 </p> 291<p> 292 (Default = nofail) 293 </p> 294</dd> 295</dl></div> 296<p> 297 </p> 298</dd> 299</dl></div> 300</div> 301<div class="refsect1" lang="en"> 302<a name="id2546326"></a><h2>FILES</h2> 303<p><code class="filename">/etc/resolv.conf</code> 304 </p> 305</div> 306<div class="refsect1" lang="en"> 307<a name="id2546338"></a><h2>SEE ALSO</h2> 308<p><span class="citerefentry"><span class="refentrytitle">dig</span>(1)</span>, 309 <span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>, 310 <span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>. 311 </p> 312</div> 313<div class="refsect1" lang="en"> 314<a name="id2546372"></a><h2>Author</h2> 315<p> 316 Andrew Cherenson 317 </p> 318</div> 319</div></body> 320</html> 321