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Numbering
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Numbering
Directory Listings:
800 Service Management System
Information about the central database for US toll free number management.
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Active Numbers Online
OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.
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Alpha Talk UK
International Numbers 0800, 0845, 0870 From Alpha Talk UK.
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Area Code Information
Detailed information on the history and current developments in North American NPA allocations.
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International Numbering Plans
A collection of all international numbering plans in the world. Some features require a paid subscription.
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Number Portability
Collates information on the regional initiatives in place to develop number portability and number pooling in the US.
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The Telephone Exchange Name Project
The historical relationship between North American telephone exchange names and numbers.
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World Telephone Numbering Guide
Detailed information and news on public numbering plans from around the world.
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