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Web Sites in Category Numbering
800 Service Management System - Information about the central database for US toll free number management.
Active Numbers Online - OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.
Area Code Information - Detailed information on the history and current developments in North American NPA allocations.
International Numbering Plans - A collection of all international numbering plans in the world. Some features require a paid subscription.
Number Portability - Collates information on the regional initiatives in place to develop number portability and number pooling in the US.
NumberPooling.org - Number pooling resource center that aggregates number pooling information from a variety of sources, including an events calendar, roles of various groups, related FCC rulings, acronyms, a glossary, information by state, region or nation.
The Telephone Exchange Name Project - The historical relationship between North American telephone exchange names and numbers.
World Telephone Numbering Guide - Detailed information and news on public numbering plans from around the world.
Related Categories:
Business > Telecommunications > Regulators
Reference > Directories > Address and Phone Numbers > Area Codes
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