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  2. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    German telephone numbers have no fixed length for area code and subscriber number (an open numbering plan). There are many ways to format a telephone number in Germany. The most prominent is DIN 5008 but the international format E.123 and Microsoft's canonical address format are also very common.

  3. Lists of North American area codes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_North_American...

    The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes

  4. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.

  5. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    This rounded the total number of digits in a subscriber telephone number to ten: a three-digit area code, a three-digit central office code, and four digits for each line. This fixed format defined the North American Numbering Plan as a closed numbering plan , [ 27 ] as opposed to developments in other countries where the number of digits was ...

  6. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    A broad division is commonly recognized between closed and open numbering plans. A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter ...

  7. World Area Codes - Wikipedia

    en.wikipedia.org/wiki/World_Area_Codes

    East Germany Europe East Germany Independent State in the World DD 1950-01-01 1990-09-30 Retired. Area is now combined with retired WAC 430, under WAC 429 1 429 42901 Germany Europe West Germany Independent State in the World Berlin DE 1950-01-01 1990-09-30 See comments for WAC 428 0 429 42902 Germany Europe Germany Independent State in the World

  8. Telephone numbers in the Americas - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    The prefixes in the Americas start with one of 1,2,5. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with the digit "2", which mostly is used by countries in Africa.

  9. List of dialling codes in Germany - Wikipedia

    en.wikipedia.org/wiki/List_of_dialling_codes_in...

    Area codes in Germany (German: Vorwahl) have two to five digits. In addition, the prefix digit 0 must be dialed when calling from within Germany, and must be omitted when calling from abroad. When calling via fixed networks within the same area, the area code is not required. In general, shorter area codes are assigned to larger cities, and ...