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E.164 is an International Telecommunications Union for Telecommunications (ITU-T) recommendation, which defines international public telecommunication numbering plans used in public switched telephone networks and other data networks. They also define the telephone number formats. E.164 numbers have a maximum of 15 digits and are written with a + prefix. An international call prefix is used to dial this numbers from normal fixed line phones.
E.164 is an international public numbering plan developed by the ITU. It is developed for telephone systems in which each assigned number has country codes, national destination code and a subscriber number. There are up to 15 digits in an E.164 number.
The E.164 number is designed to include the necessary information to successfully route calls to individual subscribers on nation’s public telephone network. The conditions involved in E.164 numbering plan are:
The combined length of significant numbers cannot exceed 15-n where n is the number of digits in the country code. This permits every country to decide the number of digits to be present in their national destination code and subscriber number. The 15 digit numbers allow an estimated 100 trillion permutations.