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800 Service Management System

Information about the central database for US toll free number management.

http://www.sms800.com/

Active Numbers Online

OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.

http://www.active-numbers.com/

Alpha Talk UK

International Numbers 0800, 0845, 0870 From Alpha Talk UK.

http://www.alphatalk.com/

Area Code Information

Detailed information on the history and current developments in North American NPA allocations.

http://www.areacode-info.com/

International Numbering Plans

A collection of all international numbering plans in the world. Some features require a paid subscription.

http://www.numberingplans.com/

Number Portability

Collates information on the regional initiatives in place to develop number portability and number pooling in the US.

http://www.ported.com/

The Telephone Exchange Name Project

The historical relationship between North American telephone exchange names and numbers.

http://ourwebhome.com/TENP/TENproject.html

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