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Numbering
Home > Telecommunication > Resources > Numbering
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
World Telephone Numbering Guide
Detailed information and news on public numbering plans from around the world.
http://phonebooth.interocitor.net/wtng/
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