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OpenDNS

OpenDNS is a free, closed-source, DNS resolution service.

OpenDNS provides the following recursive nameserver addresses for public use, mapped to the nearest operational server location by anycast routing:

  • 208.67.222.222 (resolver1.opendns.com)
  • 208.67.220.220 (resolver2.opendns.com)

OpenDNS offers DNS resolution for consumers and businesses as an alternative to using their Internet service provider‘s DNS servers. By placing company servers in strategic locations and employing a large cache of the domain names, OpenDNS usually processes queries much more quickly, thereby increasing page retrieval speed. DNS query results are sometimes cached by the local operating system and/or applications, so this speed increase may not be noticeable with every request, but only with requests that are not stored in a local cache.

Other features include a phishing filter, domain blocking and typo correction (for example, typing wikipedia.og instead of wikipedia.org). By collecting a list of malicious sites, OpenDNS blocks access to these sites when a user tries to access them through their service. OpenDNS recently launched Phishtank, where users around the world can submit and review suspected phishing sites.


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