| 800 Service Management System
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Information about the central database for US toll free number management.
 URL: http://www.sms800.com/
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| Area Code Information
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Detailed information on the history and current developments in North American NPA allocations.
URL: http://www.areacode-info.com/
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| International Numbering Plans
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A collection of all international numbering plans in the world. Some features require a paid subscription.
URL: http://www.numberingplans.com/
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| Number Portability
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Collates information on the regional initiatives in place to develop number portability and number pooling in the US.
URL: http://www.ported.com/
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| The Telephone Exchange Name Project
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The historical relationship between North American telephone exchange names and numbers.
URL: http://ourwebhome.com/TENP/TENproject.html
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