Contents  > Business  > Telecommunications  > Resources  > Numbering

See also:

• Business: Telecommunications: Regulation  (97)
• Reference: Directories: Address and Phone Numbers: Area Codes  (25)

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/

800 Service Management System Information about the central database for US toll free number management. http://www.sms800.com/

The Telephone Exchange Name Project The historical relationship between North American telephone exchange names and numbers. http://ourwebhome.com/TENP/TENproject.html