Info Phone 42373444XX.

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Example of Formatting Phone Numbers 423-734-44XX / 42373444XX
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Databases updated on September 17, 2021

What state area code is 423?

Area code 423 refers to the state TN and rate center MORRISTOWN

Which company owns the phone numbers +1 (423) 200-44XX?

Phone numbers are owned by LEVEL 3 COMMUNICATIONS, LLC - TN

Area code 423 and prefix 200 assign data ?

Assign data July 18, 2002

How many telephone numbers are in MORRISTOWN area code?

Each area code contains 423 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. MORRISTOWN currently has eight area codes: 315, 423, 507, 740, 765, 862, 973.
  • 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.