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Information about the central database for US toll free number management.
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OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.
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International Numbers 0800, 0845, 0870 From Alpha Talk UK.
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Detailed information on the history and current developments in North American NPA allocations.
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A collection of all international numbering plans in the world. Some features require a paid subscription.
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