According to Infonetics' new DDoS Prevention Appliances report, global DDoS prevention appliance revenue grew 30 percent in 2012 to $275 million, and is expected to maintain a 25 percent compound annual growth rate from 2012 to 2017.

The research firm attributes the expected market growth to the transition to IP and data, massive increases in capacity, and a new role as a highly visible target for attacks. The top two vendors in the DDoS prevention appliance market, according to Infonetics, are Arbor Networks and Radware.

"DDoS prevention appliances are the first line of defense against brute-force attacks like those we saw aimed at U.S. financial institutions last September, and most service providers and large enterprises are investing heavily in them," Jeff Wilson, Infonetics' principal analyst for security, said in a statement. "With the number, size and coverage of DDoS attacks on the rise, we expect revenue for DDoS prevention solutions to grow in the healthy double digits through 2014."

"Many vendors are reporting sharp growth in direct sales to enterprises, even though conventional wisdom says that large enterprise customers are looking at cloud-based solutions for DDoS mitigation," Wilson added.