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.

Quick facts: Status, Year started, Latest version, Organiz...
ITU-T Recommendation E.164
The international public telecommunication numbering plan
StatusIn force
Year started1984
Latest versionJune 2020
CommitteeStudy Group 2
Related standardsE.123, E.163

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