OpenDNS is a free DNS resolution service. It provides the following two 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 was launched in July 2006 by hacker/entrepreneur David Ulevitch. It received venture capital funding from Minor Ventures, which is led by CNET founder Halsey Minor.
On July 10, 2006, the service was covered by digg, Slashdot, and Wired News, which resulted in an increase of DNS requests from just over one million requests on July 9 to 30 million on July 11.
On October 2, 2006, OpenDNS launched Phishtank, an online collaborative anti-phishing database.
In 2006, OpenDNS began using the DNS Update API from DynDNS to handle updates from users with dynamic IPs.
Since January 2007, OpenDNS provides geographically distributed servers in Seattle, Palo Alto, New York, Washington, D.C., London, with planned expansions to Chicago and Hong Kong.
On June 11th, 2007, OpenDNS started advanced web filtering to optionally block adult content for their free accounts.
