Update DNS是纯净无污染防劫持的.md

2018-09-28 16:17:11 +08:00
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--- a/科学上网/DNS是纯净无污染防劫持的.md
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 * http://www.freenom.world/zh/index.html

+* https://www.opendns.com/
+
 * https://dns.yandex.com/

 * https://www.publicdns.xyz/public/puntcat.html