什么是DNS污染？

Analyzer是GreatFire的第一个项目，在2011年上线后，它一如以往的为大家提供测试服务直至今日。现在，我们做了一个新的项目叫做"Blocky"，欢迎大家试用这个全新的版本！如果您对此有任何意见和建议，请发送邮件到support@greatfire.org。

DNS即域名系统。这是一个全球性网络系统，能把域名（例如： domain.com）映射为IP地址（例如： 1.2.3.4）。DNS污染是指对域名系统的刻意干扰，使域名指向不正确的IP地址。发生这种状况时，用户无法访问目标网站，或者被重定向到某个不同的网站。

DNS查询会根据查询请求来源国家的不同，而返回不同的IP地址。这种状况已经有合理的解释。因此，目前为止，本站无法判断某个网站是否受到跟网络审查有关的DNS污染，我们只能断定某网站没有受到DNS 污染，如果满足：

  1. 在美国访问时，主机域名指向某个IP 地址，同时
  2. 在中国访问时，主机域名指向同一个IP地址。

如果域名指向不同的IP 地址，该网站有可能受到DNS污染。网站是否被dns污染，还有其他判断标准，如连接被重置，访问超时等。

More Resources: 
https://en.greatfire.org/blog/2012/may/how-unblock-websites-china-web-owners

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