Curran is urging Web site operators to deploy IPv6 following this week's revelation that less than 10% of IPv4 addresses are available.

Industry experts predict the rest of the IPv4 address supply will run out in 2012.

"We're down to the final 10% in the glass," Curran says. "Most people understand that when you're down to 10% of something, you're pretty much running out. We're there now."

When IPv4 addresses run out, carriers will give IPv6 addresses to their new customers. Those IPv6 users are likely to favor IPv6-enabled content rather than traverse gateways in order to access lesser-performing IPv4 content.

"Unless you're willing to have the path between you and one of your customers go through a third-party gateway that you don't know and that you don't have control over, you want to add IPv6 to your Web site," Curran says. "Then when customers try to access your site, you have a straight path with IPv6 and with IPv4."