Numbering
Numbering Links
- World Telephone Numbering Guide Detailed information and news on public numbering plans from around the world.
- International Dialing Codes List of all countries and international dialing codes.
- The Telephone Exchange Name Project The historical relationship between North American telephone exchange names and numbers.
- Active Numbers Online OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.
- 800 Service Management System Information about the central database for US toll free number management.
- TollFreeAppraisals.com 800 number and vanity number appraisal.
- Area Code Information Detailed information on the history and current developments in North American NPA allocations.
- 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.
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