Cox Communications appears to be interfering with file-sharing by its Internet subscribers in the same manner that has landed Comcast Corp. (CMCSA) in hot water with regulators, according to research obtained by The Associated Press. A study based on the participation of 8,175 Internet users around the world found conclusive signs of blocked file-sharing connections only at three Internet service providers: Comcast and Cox in the U.S. and StarHub in Singapore.
Of the 788 Comcast subscribers who participated in the study, 491, or 62 percent, had their connections blocked. At Cox, 82 out of 151 subscribers, or 54 percent, were blocked, according to Krishna Gummadi at the Max Planck Institute for Software Systems in Saarbruecken, Germany.
Philadelphia-based Comcast is the country's second-largest ISP, with 14.1 million subscribers. Atlanta-based Cox Communications is the fourth-largest, with 3.8 million. It is part of privately held Cox Enterprises Inc. Comcast's practice of interfering with traffic was brought to light by user reports last year and confirmed by an AP investigation in October.