Because his servers had long ago added an extra security identifier to their DNS requests, OpenDNS circumvented Kaminsky's hack.

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Ulevitch's hacker paranoia inspired him to add an extra security feature: All DNS servers tag data with one random number (from 1 to 65, 000) to enable servers to recognize the right piece of data at the right time.

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It also offers a range of security services, including managed DNS, Distributed Denial of Service (DDoS) mitigation and cyber-threat reporting.

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The method is known as DNS amplification, and is something that cyber security experts have known about for some time.

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The security flaw, found in the DNS servers used by large companies and Internet service providers (ISPs), could allow cybercriminals to perform a new, undetectable form of "phishing, " security analysts warn.

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According to Mr. Smith, "hosting providers, businesses, and people with a cloud server who set up their own DNS resolver" often neglect to configure their servers using proper security settings.

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In fact, security researchers have only a hazy idea of how much DNS-related cybercrime is actually occurring, though researchers at Georgia Tech published a study earlier this year claiming that 0.4% of checkable DNS servers were redirecting users to sites they didn't intend to visit.

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In July, security researcher Dan Kaminsky revealed a flaw in the Web's domain name system, or DNS, the protocol that connects a Web site's name with its physical location on the Internet.

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