OpenDNS' services could be used to help out branch offices or remote workers, or to serve as backup DNS systems for enterprise customers, he said. "We don't believe our job is going to be to replace enterprise DNS," he said, "but we believe there's an opportunity to compliment these on-premise or in-cloud services."

OpenDNS makes its DNS servers freely available to other computers on the Internet, giving them a way to convert domain names such as amazon.com into the numerical Internet Protocol addresses computers use to find each other on the Internet.

Although Internet service providers typically provide DNS services to their customers, OpenDNS has attracted users by promising faster lookups and by adding new features to the service that let users block dangerous or inappropriate servers from reaching their networks.

The company makes its money by providing search-based ads to users of its service, and is now handling between 8 billion and 9 billion DNS lookups per day.