“Over the past two decades, this content has transformed nearly every aspect of our lives, from profound actions like choosing a leader, building a career, and falling in love to more quotidian ones like hailing a cab and watching a movie,” wrote David Tatel and Sri Srinivasan, the judges who wrote the opinion.
But the legal battle over the regulations is most likely far from over. The cable and telecom industries have signaled their intent to challenge any unfavorable decision, possibly taking the case to the Supreme Court.
AT&T immediately said it would continue to fight.
“We have always expected this issue to be decided by the Supreme Court and we look forward to participating in that appeal,” said David McAtee II, the senior executive vice president and general counsel for AT&T.
For now, the decision limits the ability of broadband providers like Comcast and Verizon to shape the experience of internet users. Without net neutrality rules, the broadband providers could be inclined to deliver certain content on the web at slower speeds, for example, making the streams on Netflix or YouTube buffer or shut down. Such business decisions by broadband providers would have created fast and slow lanes on the internet, subjecting businesses and consumers to extra charges and limited access to content online, the F.C.C. has argued.
“This is an enormous win for consumers,” said Gene Kimmelman, president of the public interest group Public Knowledge. “It ensures the right to an open internet with no gatekeepers.”
The 184-page ruling also opens a path for new limits on broadband providers beyond net neutrality. Already, the F.C.C. has proposed privacy rules for broadband providers, curbing the ability of companies like Verizon and AT&T to collect and share data about broadband subscribers.
Google and Netflix support net neutrality rules and have warned government officials that without regulatory limits, broadband providers will have an incentive to create business models that could harm consumers. They argue that broadband providers could degrade the quality of downloads and streams of online services to extract tolls from web companies or to promote unfairly their own competing services or the content of partners.
The court’s ruling was a certainty for the F.C.C. Two of the three judges who heard the case late last year agreed that wireless broadband services were also common carrier utility services that were subject to anti-blocking and discrimination rules, a decision protested by wireless carriers including AT&T and Verizon Wireless.
In the opinion, the two judges in favor of the rules said internet users don’t feel the difference between fixed-wire broadband and mobile service. To an iPad user, whose device switches automatically between Wi-Fi and wireless networks, the government’s oversight of those technologies should not differ, they said.
Tech firms cheered the decision, which they said would be particularly helpful to start-ups that did not have the resources to fight gatekeepers of the web.
“Today marks a huge victory for the millions of microbusinesses who depend on the open internet to reach consumers and compete in the global marketplace,” said Althea Erickson, the senior director of global policy at the online crafts marketplace Etsy.
In a statement, the cable industry’s biggest lobbying group highlighted the comments of the dissenting judge, Stephen Williams, and said that its members were reviewing the opinion. The group also said broadband legislation by Congress was a better alternative to the F.C.C.’s classification of internet business as a utility.
“While this is unlikely the last step in this decade-long debate over internet regulation, we urge bipartisan leaders in Congress to renew their efforts to craft meaningful legislation that can end ongoing uncertainty, promote network investment and protect consumers,” the National Cable and Telecommunications Association said in a statement.
In his lengthy dissenting opinion, Mr. Williams called the rules an “unreasoned patchwork” that will discourage competition in the broadband industry.
The biggest threat to broadband providers is the potential of any regulations to hurt the rates they charge for the service, analysts said. The F.C.C. has promised it will not impose rate regulations on the firms like it does for phone companies.
“The pendulum has today swung a bit further in the direction of long-term price regulation,” said Craig Moffett, an analyst at the research firm MoffettNathanson.
The F.C.C. was divided along party lines on the rules. It began its quest for net neutrality rules in 2009, with two previous attempts at creating rules overturned by the same court.
In a statement, Ajit Pai, a Republican commissioner who was among a minority who opposed the regulation of broadband as a utility, urged cable and telecom firms to keep going with their legal challenge.
“I continue to believe that these regulations are unlawful, and I hope that the parties challenging them will continue the legal fight,” he said.
An earlier version of this article misattributed a statement by a cable industry lobbying group. The statement was made by the National Cable & Telecommunications Association; it was not made by the group’s president, Michael Powell.