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<h1 id="dig">dig</h1><p>域名查询工具</p>
<h2 id="补充说明">补充说明</h2><p><strong>dig命令</strong> 是常用的域名查询工具，可以用来测试域名系统工作是否正常。</p>
<h3 id="语法">语法</h3><pre><code class="language-shell">dig<span class="token punctuation">(</span>选项<span class="token punctuation">)</span><span class="token punctuation">(</span>参数<span class="token punctuation">)</span></code></pre>
<h3 id="选项">选项</h3><pre><code class="language-shell">@<span class="token operator"><</span>服务器地址<span class="token operator">></span>：指定进行域名解析的域名服务器；
-b<span class="token operator"><</span>ip地址<span class="token operator">></span>：当主机具有多个IP地址，指定使用本机的哪个IP地址向域名服务器发送域名查询请求；
-f<span class="token operator"><</span>文件名称<span class="token operator">></span>：指定dig以批处理的方式运行，指定的文件中保存着需要批处理查询的DNS任务信息；
-P：指定域名服务器所使用端口号；
-t<span class="token operator"><</span>类型<span class="token operator">></span>：指定要查询的DNS数据类型；
-x<span class="token operator"><</span>IP地址<span class="token operator">></span>：执行逆向域名查询；
-4：使用IPv4；
-6：使用IPv6；
-h：显示指令帮助信息。</code></pre>
<h3 id="参数">参数</h3><ul>
<li>主机：指定要查询域名主机；</li>
<li>查询类型：指定DNS查询的类型；</li>
<li>查询类：指定查询DNS的class；</li>
<li>查询选项：指定查询选项。</li>
</ul>
<h3 id="实例">实例</h3><pre><code class="language-shell"><span class="token punctuation">[</span>root@localhost ~<span class="token punctuation">]</span><span class="token comment"># dig www.jsdig.com</span>
<span class="token punctuation">;</span> <span class="token operator"><<</span><span class="token operator">>></span> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5_8.1 <span class="token operator"><<</span><span class="token operator">>></span> www.jsdig.com
<span class="token punctuation">;</span><span class="token punctuation">;</span> global options: printcmd
<span class="token punctuation">;</span><span class="token punctuation">;</span> Got answer:
<span class="token punctuation">;</span><span class="token punctuation">;</span> -<span class="token operator">>></span>HEADER<span class="token operator"><<</span>- opcode: QUERY, status: NOERROR, id: 2115
<span class="token punctuation">;</span><span class="token punctuation">;</span> flags: qr rd ra<span class="token punctuation">;</span> QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0
<span class="token punctuation">;</span><span class="token punctuation">;</span> QUESTION SECTION:
<span class="token punctuation">;</span>www.jsdig.com. IN A
<span class="token punctuation">;</span><span class="token punctuation">;</span> ANSWER SECTION:
www.jsdig.com. 0 IN CNAME host.1.jsdig.com.
host.1.jsdig.com. 0 IN A 100.42.212.8
<span class="token punctuation">;</span><span class="token punctuation">;</span> AUTHORITY SECTION:
jsdig.com. 8 IN NS f1g1ns2.dnspod.net.
jsdig.com. 8 IN NS f1g1ns1.dnspod.net.
<span class="token punctuation">;</span><span class="token punctuation">;</span> Query time: 0 msec
<span class="token punctuation">;</span><span class="token punctuation">;</span> SERVER: 202.96.104.15<span class="token comment">#53(202.96.104.15)</span>
<span class="token punctuation">;</span><span class="token punctuation">;</span> WHEN: Thu Dec 26 11:14:37 2013
<span class="token punctuation">;</span><span class="token punctuation">;</span> MSG SIZE rcvd: 121</code></pre>
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