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whatUseek Directory Site Listings:
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 Dialing Codes
- List of all countries and international dialing codes.
NUMSpell.com
- A reverse lookup for business telephone numbers and personal toll free numbers. A database that converts numbers into words.
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.
Telecom Tools Online
- Online calculators which provide detailed technical information on US number allocations and routing.
The Telephone Exchange Name Project
- The historical relationship between North American telephone exchange names and numbers.
TollFreeAppraisals.com
- 800 number and vanity number appraisal.
World Telephone Numbering Guide
- Detailed information and news on public numbering plans from around the world.
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