Sources of information on the history and development of worldwide public telephone numbering plans.
Related categories 2
800 Service Management System
Information about the central database for US toll free number management.
International Numbering Plans
A collection of all international numbering plans in the world. Some features require a paid subscription.
The Telephone Exchange Name Project
The historical relationship between North American telephone exchange names and numbers.
Last update:January 2, 2007 at 17:49:35 UTC