Active Numbers Online
OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.
http://www.active-numbers.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/ |
Alpha Talk UK
International Numbers 0800, 0845, 0870 From Alpha Talk UK.
http://www.alphatalk.com/ |
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