Categories related to Business: Telecommunications: Resources: Numbering: Business: Telecommunications: Regulation (97) Reference: Directories: Address and Phone Numbers: Area Codes (25) Websites on Numbering: 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. 800 Service Management System Information about the central database for US toll free number management. The Telephone Exchange Name Project The historical relationship between North American telephone exchange names and numbers.
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