Numbering (Subscribe)
Links
800 Service Management SystemInformation about the central database for US toll free number management.
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Active Numbers Onlinehttp://www.active-numbers.com/ OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.
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Area Code InformationDetailed information on the history and current developments in North American NPA allocations.
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International Numbering Planshttp://www.numberingplans.com/ A collection of all international numbering plans in the world. Some features require a paid subscription.
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Number PortabilityCollates information on the regional initiatives in place to develop number portability and number pooling in the US.
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