E.164
ITU-T Recommendation for telephone numbering / From Wikipedia, the free encyclopedia
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E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks.
| The international public telecommunication numbering plan | |
| Status | In force |
|---|---|
| Year started | 1984 |
| Latest version | June 2020 |
| Organization | ITU-T |
| Committee | Study Group 2 |
| Related standards | E.123, E.163 |
| Domain | telephony |
| Website | https://www.itu.int/rec/T-REC-E.164/ |
E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits.[1] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits.
Alternative formats (with area codes and country specific numbers) are available. Any country-specific international call prefixes are not contained in the specification.
The title of the original version and first revision of the E.164 standard was Numbering Plan for the ISDN Era