Data cap cash. (credit: Aurich Lawson | Getty Images)

A company that tracks ISPs and data caps in the US has identified 196 home Internet providers that impose monthly caps on Internet users. Not all of them are enforced, but customers of many ISPs must pay overage fees when they use too much data.

BroadbandNow, a broadband provider search site that gets referral fees from some ISPs, has more than 2,500 home Internet providers in its database. This list includes telecommunications providers that are registered to provide service under the government's Lifeline program, which subsidizes access for poor people. BroadbandNow's team looked through the ISPs' websites to generate a list of those with data caps.

The data cap information was "pulled directly from ISP websites," BroadbandNow Director of Content Jameson Zimmer told Ars. "For those that have multiple caps, we include the lowest one and an asterisk to show that they have regional variation."

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