Linux命令之nslookup

最新推荐文章于 2025-05-21 23:25:53 发布

转载最新推荐文章于 2025-05-21 23:25:53 发布 · 343 阅读

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NSLookup是一个用于查询互联网域名服务器的有用工具，它可以帮助我们获取关于指定域名的详细信息，包括将域名转换为IP地址或反之亦然。通过使用NSLookup，可以查询到如微软官网microsoft.com对应的两个IP地址，这表明其采用了轮询设置来均衡服务器负载。

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http://www.computerhope.com/unix/unslooku.htm

About nslookup

The nslookup command is used to query internet name servers interactively for information.

Overview

nslookup, which stands for "name server lookup", is a useful tool for finding out information about a named domain.

By default, nslookup will translate a domain name to an IP address (or vice versa). For instance, to find out what the IP address of microsoft.com is, you could run the command:

nslookup microsoft.com

...and you would receive a response like this:

Server:     8.8.8.8
Address:    8.8.8.8#53

Non-authoritative answer:
Name:    microsoft.com
Address: 134.170.185.46
Name:    microsoft.com
Address: 134.170.188.221

Here, 8.8.8.8 is the address of our system's Domain Name Server. This is the server our system is configured to use to translate domain names into IP addresses. "#53" indicates that we are communicating with it on port 53, which is the standard port number domain name servers use to accept queries.

Below this, we have our lookup information for microsoft.com. Our name server returned two entries, 134.170.185.46 and 134.170.188.221. This indicates thatmicrosoft.com uses a round robin setup to distribute server load. When you accessmicrsoft.com, you may be directed to either of these servers and your packets will berouted to the correct destination.

You can see that we have received a "Non-authoritative answer" to our query. An answer is "authoritative" only if our DNS has the complete zone file information for the domain in question. More often, our DNS will have a cache of information representing the last authoritative answer it received when it made a similar query; this information is passed on to you, but the server qualifies it as "non-authoritative": the information was recently received from an authoritative source, but the DNS server is not itself that authority.