What is OpenDNS? - Definition from WhatIs.com
Part of the Network security glossary:

OpenDNS is the world’s largest domain name system (DNS) service provider.

The ISP-independent service  adds extra features and offers an optional cloud-based security service. OpenDNS does not require software installation and can be set with options for zero configuration or customized filtering.  Optional parental controls can filter all connected network devices. Security features include anti-phishing and anti-identity theft protection.

OpenDNS’s large caches and many server locations enable faster name retrieval. Built-in redundancy improves reliability in a self-healing network built over three continents.

OpenDNS is available as a free ad-supported service. A premium ad-free version offers customer support and the company’s Umbrella security packages on a subscription basis. The premium version also provides reports on Internet resource use.

In operation since 1996, OpenDNS supports tens of millions of users.

This was last updated in September 2013
Contributor(s): Matthew Haughn
Posted by: Margaret Rouse

Related Terms


  • email spoofing

    - Email spoofing is the forgery of an email header so that the message appears to have originated from someone or somewhere other than the actual source. (SearchSecurity.com)

  • buffer overflow

    - A buffer overflow occurs when a program attempts to write more data to a fixed length block of memory, or buffer, than the buffer is allocated to hold. Buffer overflow exploits may enable remote ex... (SearchSecurity.com)

  • private key (secret key)

    - A private (secret) key is an encryption key whose value should never be made public. The term may refer to the private key of an asymmetric key pair or a key shared by parties who are using symmetr... (SearchSecurity.com)


  • Network security

    - Terms related to network security, including definitions about intrusion prevention and words and phrases about VPNs and firewalls.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question

Tech TalkComment



    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.