Info Phone 17143071XX.

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Example of Formatting Phone Numbers 171-430-71XX / 17143071XX
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Databases updated on April 17, 2021

How many telephone numbers are in area code?

Each area code contains 171 usable telephone prefixes, which are the 3-digit numbers that follow the area code. Each prefix has 10,000 telephone numbers, and each area code has 7.92 million telephone numbers. 

What makes up a telephone number?

Our telephone numbering system operates under the North American Numbering Plan, which was developed in 1947 by AT&T and subsequently adopted by the Federal Communications Commission (FCC). It established the 10-digit scheme we use today.

Area Code NPA NXX
  • The "NPA" (Number Plan Area) is the area code. currently has eight area codes: 317, 504, 530, 704, 904, 910, 954.
  • The "NXX" is the central office (CO) code, and is also referred to as the "prefix." An NXX serves a specific exchange or rate center.
  • The XXXX is the line number for the customer.

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