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Ranges for fictitious telephone numbers are common in most telephone numbering plans. One of the main reasons these ranges exist is to avoid accidentally using real phone numbers in movies and television programs because of viewers frequently calling the numbers used.
Telephone numbers in Vietnam; Location; Country: Vietnam: Continent: Asia: Regulator: MIC: Type: Open: NSN length: 1 to 10: Format: 02xx xxx xxxx (geographical) 09/08/07/05/03xx xxx xxx (mobile) Access codes; Country code +84: International access: 00: Long-distance: 0
However, generally they are considerably slower (typically by a factor 2–10) than fast, non-cryptographic random number generators. These include: Stream ciphers. Popular choices are Salsa20 or ChaCha (often with the number of rounds reduced to 8 for speed), ISAAC, HC-128 and RC4. Block ciphers in counter mode.
National (significant) number: 10 Digits. Area code: 3 digits; Local subscriber's number: 7 digits. Only exception in this is the call center numbers which start with 444, the call center numbers cannot be dialed with area code, they must be dialed with 7 digit from any phone (Landlines & Mobiles) in the country. The number format is 444 XX XX.
The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-XXXX, in each numbering plan area (NPA) (area code).
Random number generation is a process by which, often by means of a random number generator (RNG), a sequence of numbers or symbols that cannot be reasonably predicted better than by random chance is generated. This means that the particular outcome sequence will contain some patterns detectable in hindsight but impossible to foresee.
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