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New York's attorney general has asked three major Internet providers to validate claims that customers are getting the access speed promised, especially for premium services.

The office of Attorney General Eric Schneiderman said it's "concerned" consumers paying for service from Time Warner, Cablevision and Verizon might not be getting the speeds advertised.

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Comcast, a cable and Internet service provider, is the parent company of NBC News.

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The request seeks the providers' total broadband customers since 2011 and respective service levels, all disclosures to actual or potential customers about Internet speeds since 2013, substantiation for specific claims, customer complaints and copies of Internet interconnection agreements.

The attorney general's letter cites particular concerns, mainly those related to interconnection agreements about premium options.

Cablevision says its Optimum Online service "consistently surpasses" advertised broadband speeds.

Time Warner and Verizon didn't immediately respond Monday to requests for comment from the Associated Press.

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