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Area code 423

Area code 423 serves Tennessee, including Chattanooga, Johnson City and Bristol (Eastern and Central time). It has been in service since September 11, 1995 and shares its area with 729.

Numbers starting with 423 drew 3,686 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 913 complaints to the FCC since November 2023. The number on your screen can be faked, so a 423 number proves nothing about where a call came from.

Location
TennesseeChattanooga, TN-GA Metropolitan Statistical Area and Knoxville, TN Metropolitan Statistical Area
Time zone
Eastern and Central
In service since
September 11, 1995Created from 615
Overlay
Same area as 729
Local calls
Dial 10 digitsArea code needed, even next door
Exchanges in use
764 of 792held by 55 carriers
Projected to run out
1Q 2090NANPA forecast 2026.2

Complaints about 423 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 423. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

3,686

FCC complaints since November 2023

913

Different 423 numbers reported

4,307

FCC complaints naming a 423 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 202325
December 202322
January 202433
February 202412
March 202412
April 202435
May 202439
June 202422
July 202429
August 202436
September 202416
October 202422
November 202432
December 202441
January 202540
February 202517
March 202515
April 202510
May 202529
June 202524
July 202524
August 202518
September 202537
October 20250
November 20259
December 202518
January 202616
February 202620
March 202617
April 202618
May 202617
June 202614
July 202631
August 202648
September 202655
October 202645

What people said 423 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 2,274 of 3,686 reports were robocalls.

Show as a table
SubjectReports
Other1,642
Medical and prescriptions665
Reducing your debt (credit cards, mortgage, student loans)356
Calls pretending to be government, businesses, or family and friends355
Dropped call or no message198
Warranties and protection plans86

Most reported 423 numbers

Numbers with at least five reports from three or more places in the last twelve months. Many of them are likely spoofed.

Places served by 423

NANPA lists 75 rate centers for 423. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Chattanooga183
  • Johnson City67
  • Bristol38
  • Cleveland33
  • Kingsport32
  • Morristown28
  • Athens22
  • Greeneville20
  • La Follette16
  • Newport15
  • Elizabethton13
  • Midway (sullivan)12
  • Rogersville12
  • Blountville10
  • Benton9
  • Bulls Gap9
  • Charleston9
  • Sweetwater9
  • Dayton8
  • Erwin8
  • Madisonville8
  • Soddy Daisy8
  • Limestone7
  • Oneida7
Show all 75 rate centers

Pikeville, Sneedville, South Pittsburg, Fall Branch, Mountain City, New Tazewell, Bluff City, Butler, Copper Basin, Cumberland Gap, Englewood, Etowah, Jellico, Midway (washington), Spring City, Church Hill, Decatur, Georgetown, Jasper, Jonesboro, Mosheim, Sullivan Gardens, Surgoinsville, Tellico Plains, Baileyton, Collegedale, Fork Ridge, Hampton, Huntsville, Ooltewah, Roan Mountain, Stoney Creek, Vonore, Whitwell, Apison, Ball Play, Clinchport, Coker Creek, College Station, Deer Lodge, Dunlap, Fall Creek Falls, Niota, Oakdale, Riceville, Robbins, Sunbright, Wartburg, Nine Mile, Petros, Shady Valley.

Phone companies holding 423 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 74% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 55 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
Bellsouth Telecomm Inc dba South Central Bell Tel119
United Telephone-Southeast-TN dba Centurylink - TN83
Cellco Partnership dba Verizon Wireless - TN80
New Cingular Wireless PCS, LLC - GA80
Onvoy, LLC - TN54
Level 3 Communications, LLC - TN38
Paetec Itel, LLC33
Bandwidth.com CLEC, LLC - TN30

When today's 423 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
200118
200237
200310
20049
20057
200611
200714
200815
20099
201010
201113
20128
20135
20149
201511
20168
201710
201817
201911
202014
202129
202217
202326
20247
202513
20267

Check a 423 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in Tennessee

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show