Web应用程序客户端DNS服务器检测
在 opendns.org 网站上，其内容会根据您是否使用其 DNS 服务器而变化。如果您不这样做，则会提示用户更改其 DNS 设置。如果您的计算机设置为使用其 DNS 服务器，则标注是用于管理您的设置的链接。他们如何检测客户端 DNS 服务器的设置？
On the opendns.org website, their content changes based on if you are using their DNS servers or not. If you are not, then there is a callout to the user to change their DNS settings. If your machine is setup to use their DNS servers then the callout is a link to manage your settings. How are they able to detect what the client's DNS servers are set to?
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目前可在 https://gdns.re/edns-demo 获取方法和演示。
用我的话说：
A method and a demo are currently available at https://gdns.re/edns-demo.
In my words:
没有办法专门找出客户端的 DNS 服务器。但是，您确实拥有客户端 IP。这样，您就可以检查它是否在您拥有的数据库中（正如 Brian 指出的那样），如果它不在数据库中，您仍然可以将 IP 解析为主机名，并查找该域的名称服务器。这是可以找出的两种方法 - 这与积极检测略有不同。
There isn't a way to find out the client's DNS server specifically. However, you do have the clients IP. With that you can check if it's in a database that you have - as Brian pointed out - and if it's not in there you could still resolve the IP to a host name and lookup what the name servers are for that domain. These are the two ways that it could be figured out - which is slightly different than positively detected.