A man who allegedly posted YouTube videos showing how to steal high-speed Internet access was busted yesterday on charges of selling “hacked” cable modems, authorities said.

Matthew Delorey, 26, is accused of marketing the hardware — which allows Comcast cable subscribers to steal Internet access — on Craigslist and through a Web site, massmodz.com.

According to a Manhattan federal court complaint, Delorey, of New Bedford, Mass., last year sold numerous modified cable modems, two of which went to an undercover FBI agent.