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="id2476277"></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="id2543435"></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="id2543451"></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</div> 80<div class="refsect1" lang="en"> 81<a name="id2543495"></a><h2>INTERACTIVE COMMANDS</h2> 82<div class="variablelist"><dl> 83<dt><span class="term"><code class="constant">host</code> [<span class="optional">server</span>]</span></dt> 84<dd> 85<p> 86 Look up information for host using the current default server or 87 using server, if specified. If host is an Internet address and 88 the query type is A or PTR, the name of the host is returned. 89 If host is a name and does not have a trailing period, the 90 search list is used to qualify the name. 91 </p> 92<p> 93 To look up a host not in the current domain, append a period to 94 the name. 95 </p> 96</dd> 97<dt><span class="term"><code class="constant">server</code> <em class="replaceable"><code>domain</code></em></span></dt> 98<dd><p></p></dd> 99<dt><span class="term"><code class="constant">lserver</code> <em class="replaceable"><code>domain</code></em></span></dt> 100<dd><p> 101 Change the default server to <em class="replaceable"><code>domain</code></em>; <code class="constant">lserver</code> uses the initial 102 server to look up information about <em class="replaceable"><code>domain</code></em>, while <code class="constant">server</code> uses 103 the current default server. If an authoritative answer can't be 104 found, the names of servers that might have the answer are 105 returned. 106 </p></dd> 107<dt><span class="term"><code class="constant">root</code></span></dt> 108<dd><p> 109 not implemented 110 </p></dd> 111<dt><span class="term"><code class="constant">finger</code></span></dt> 112<dd><p> 113 not implemented 114 </p></dd> 115<dt><span class="term"><code class="constant">ls</code></span></dt> 116<dd><p> 117 not implemented 118 </p></dd> 119<dt><span class="term"><code class="constant">view</code></span></dt> 120<dd><p> 121 not implemented 122 </p></dd> 123<dt><span class="term"><code class="constant">help</code></span></dt> 124<dd><p> 125 not implemented 126 </p></dd> 127<dt><span class="term"><code class="constant">?</code></span></dt> 128<dd><p> 129 not implemented 130 </p></dd> 131<dt><span class="term"><code class="constant">exit</code></span></dt> 132<dd><p> 133 Exits the program. 134 </p></dd> 135<dt><span class="term"><code class="constant">set</code> 136 <em class="replaceable"><code>keyword[<span class="optional">=value</span>]</code></em></span></dt> 137<dd> 138<p> 139 This command is used to change state information that affects 140 the lookups. Valid keywords are: 141 </p> 142<div class="variablelist"><dl> 143<dt><span class="term"><code class="constant">all</code></span></dt> 144<dd><p> 145 Prints the current values of the frequently used 146 options to <span><strong class="command">set</strong></span>. 147 Information about the current default 148 server and host is also printed. 149 </p></dd> 150<dt><span class="term"><code class="constant">class=</code><em class="replaceable"><code>value</code></em></span></dt> 151<dd> 152<p> 153 Change the query class to one of: 154 </p> 155<div class="variablelist"><dl> 156<dt><span class="term"><code class="constant">IN</code></span></dt> 157<dd><p> 158 the Internet class 159 </p></dd> 160<dt><span class="term"><code class="constant">CH</code></span></dt> 161<dd><p> 162 the Chaos class 163 </p></dd> 164<dt><span class="term"><code class="constant">HS</code></span></dt> 165<dd><p> 166 the Hesiod class 167 </p></dd> 168<dt><span class="term"><code class="constant">ANY</code></span></dt> 169<dd><p> 170 wildcard 171 </p></dd> 172</dl></div> 173<p> 174 The class specifies the protocol group of the information. 175 176 </p> 177<p> 178 (Default = IN; abbreviation = cl) 179 </p> 180</dd> 181<dt><span class="term"><code class="constant"> 182 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>debug</code></span></dt> 183<dd> 184<p> 185 Turn on or off the display of the full response packet and 186 any intermediate response packets when searching. 187 </p> 188<p> 189 (Default = nodebug; abbreviation = [<span class="optional">no</span>]deb) 190 </p> 191</dd> 192<dt><span class="term"><code class="constant"> 193 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>d2</code></span></dt> 194<dd> 195<p> 196 Turn debugging mode on or off. This displays more about 197 what nslookup is doing. 198 </p> 199<p> 200 (Default = nod2) 201 </p> 202</dd> 203<dt><span class="term"><code class="constant">domain=</code><em class="replaceable"><code>name</code></em></span></dt> 204<dd><p> 205 Sets the search list to <em class="replaceable"><code>name</code></em>. 206 </p></dd> 207<dt><span class="term"><code class="constant"> 208 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>search</code></span></dt> 209<dd> 210<p> 211 If the lookup request contains at least one period but 212 doesn't end with a trailing period, append the domain 213 names in the domain search list to the request until an 214 answer is received. 215 </p> 216<p> 217 (Default = search) 218 </p> 219</dd> 220<dt><span class="term"><code class="constant">port=</code><em class="replaceable"><code>value</code></em></span></dt> 221<dd> 222<p> 223 Change the default TCP/UDP name server port to <em class="replaceable"><code>value</code></em>. 224 </p> 225<p> 226 (Default = 53; abbreviation = po) 227 </p> 228</dd> 229<dt><span class="term"><code class="constant">querytype=</code><em class="replaceable"><code>value</code></em></span></dt> 230<dd><p></p></dd> 231<dt><span class="term"><code class="constant">type=</code><em class="replaceable"><code>value</code></em></span></dt> 232<dd> 233<p> 234 Change the type of the information query. 235 </p> 236<p> 237 (Default = A; abbreviations = q, ty) 238 </p> 239</dd> 240<dt><span class="term"><code class="constant"> 241 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>recurse</code></span></dt> 242<dd> 243<p> 244 Tell the name server to query other servers if it does not 245 have the 246 information. 247 </p> 248<p> 249 (Default = recurse; abbreviation = [no]rec) 250 </p> 251</dd> 252<dt><span class="term"><code class="constant">ndots=</code><em class="replaceable"><code>number</code></em></span></dt> 253<dd><p> 254 Set the number of dots (label separators) in a domain 255 that will disable searching. Absolute names always 256 stop searching. 257 </p></dd> 258<dt><span class="term"><code class="constant">retry=</code><em class="replaceable"><code>number</code></em></span></dt> 259<dd><p> 260 Set the number of retries to number. 261 </p></dd> 262<dt><span class="term"><code class="constant">timeout=</code><em class="replaceable"><code>number</code></em></span></dt> 263<dd><p> 264 Change the initial timeout interval for waiting for a 265 reply to number seconds. 266 </p></dd> 267<dt><span class="term"><code class="constant"> 268 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>vc</code></span></dt> 269<dd> 270<p> 271 Always use a virtual circuit when sending requests to the 272 server. 273 </p> 274<p> 275 (Default = novc) 276 </p> 277</dd> 278<dt><span class="term"><code class="constant"> 279 <em class="replaceable"><code>[<span class="optional">no</span>]</code></em>fail</code></span></dt> 280<dd> 281<p> 282 Try the next nameserver if a nameserver responds with 283 SERVFAIL or a referral (nofail) or terminate query 284 (fail) on such a response. 285 </p> 286<p> 287 (Default = nofail) 288 </p> 289</dd> 290</dl></div> 291<p> 292 </p> 293</dd> 294</dl></div> 295</div> 296<div class="refsect1" lang="en"> 297<a name="id2546309"></a><h2>FILES</h2> 298<p><code class="filename">/etc/resolv.conf</code> 299 </p> 300</div> 301<div class="refsect1" lang="en"> 302<a name="id2546321"></a><h2>SEE ALSO</h2> 303<p><span class="citerefentry"><span class="refentrytitle">dig</span>(1)</span>, 304 <span class="citerefentry"><span class="refentrytitle">host</span>(1)</span>, 305 <span class="citerefentry"><span class="refentrytitle">named</span>(8)</span>. 306 </p> 307</div> 308<div class="refsect1" lang="en"> 309<a name="id2546355"></a><h2>Author</h2> 310<p> 311 Andrew Cherenson 312 </p> 313</div> 314</div></body> 315</html> 316