Discovering the truth about a phone number, email, or address history can be eye-opening, please use this tool with caution.USA Area code 423 - Chattanooga, TN
Area code 423 is a North American Numbering Plan telephone area code serving Area code in East Tennessee, United States in Tennessee. It was activated in 1995 and today covers roughly 194,144 residents across 1 cities and towns, primarily in Sequatchie County .
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Who called me from area code 423?
A call from area code 423 most likely originates from Chattanooga or elsewhere in Tennessee - but caller ID spoofing means the area code alone cannot confirm who called. Right now, 25 423 numbers carry scam reports on this page. The only reliable way to identify the caller is to check the full 10-digit number:
- Run the number through the reverse phone lookup at the top of this page to see the owner's name, carrier, and location.
- Compare it against the recently reported scam numbers in 423 below.
- If the call was unwanted, report it to the FTC and use the report form on this page so other 423 residents see it.
Report a scam call from 423 Help other 423-area residents - takes 20 seconds, no signup
Reports are reviewed by our team before appearing on the page. The highest-reported numbers get added to the “Recently reported scam numbers” list above with a “community” badge.
Should I answer a call from a 423 number? Take the 30-second quiz - 5 questions, verdict + advice
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Next step: run a reverse-phone lookup on the number to see everything public about it.
Where is the 423 area code? Coverage map
The pin marks Chattanooga, the largest city served by area code 423. Zoom and pan to explore the coverage region.
Interactive map. Click a pin for city details. Data © OpenStreetMap contributors.
Area codes near 423 (overlay + neighboring)
If a caller ID shows one of these codes, the call is probably still from the Chattanooga area or a nearby region. Click any code to see its own page.
423 area code robocall complaints (FCC data)
Monthly count of FCC complaints tagged to numbers in area code 423 over the last 12 months.
148 complaints in the last 12 months. That's about 422% more robocall complaints per capita than the US average - 76 per 100,000 residents vs a national average of 14.6.
Source: FCC Consumer Complaint Data (dataset vakf-fz8e). Data as of August 6, 2026. Refreshed monthly.
How 423 area code spam calls arrive
Based on 148 FCC complaints in the last 12 months, here's how 423 spam calls reached recipients:
FCC Consumer Complaint Data, last 12 months as of August 6, 2026. Refreshed monthly. Note: the FCC dataset labels method (Live Voice / Prerecorded / SMS) but does not classify scam type (IRS impersonation, tech support fraud, etc.) - those come from community reports.
Recently reported scam numbers in 423
Numbers reported to the FCC or by our community in the last 12 months. Click any to run a full reverse-phone lookup.
Source: FCC Consumer Complaint Data, last 12 months as of August 6, 2026. Refreshed monthly. Numbers submitted via the report form near the top of this page get added here with a “community” badge after moderation.
How to block 423 spam calls (by carrier)
Getting repeated spam calls from 423 numbers around Chattanooga, Tennessee? You can't legitimately block every 423 call without also missing legitimate ones from Chattanooga, Tennessee - so the practical fix is to turn on your carrier's free spam filter and register on the national do-not-call list. Step-by-step for each major US carrier below.
AT&T
- Download the free AT&T ActiveArmor app (iOS + Android).
- Sign in with your wireless number.
- Enable Fraud Blocking and Suspected Spam Warning.
- To block a specific number, tap the call in your history → Block.
Verizon
- Download the free Verizon Call Filter app (iOS + Android).
- Sign in with your Verizon account.
- Turn on Spam Filter.
- To block a specific number: My Verizon → Blocks → Add Number.
T-Mobile
- Download the free Scam Shield app (iOS + Android).
- Enable Scam Block (blocks known scam calls silently).
- Use Scam ID to see “Scam Likely” caller ID on suspicious numbers.
- To block a specific number, dial
#662#from your device.
All carriers
- Register on the FTC's National Do-Not-Call list.
- Report unwanted calls to the FCC at fcc.gov/complaints.
- On iPhone: Settings → Phone → Silence Unknown Callers.
- On Android: Phone app → ⋮ → Settings → Caller ID & spam.
Sources: carrier support pages (AT&T, Verizon, T-Mobile), FCC consumer guides. Free features as of 2026. Every one of these steps costs nothing.
History of the 423 area code
state of Tennessee. The numbering plan area comprises two geographically disjoined areas of East Tennessee, separated by numbering plan area 865, as well as portions of Van Buren and Sequatchie counties in Middle Tennessee.
423 area code FAQ: common questions
What area code is 423?
Area code 423 is a North American Numbering Plan area code that serves Area code in East Tennessee, United States in Tennessee, primarily including Chattanooga and surrounding communities. It was activated in 1995.
Where does area code 423 cover?
Area code 423 covers Sequatchie County, Van Buren County, including cities such as Chattanooga.
Is 423 a real area code or a scam?
423 is a real, actively-assigned US area code - not itself a scam. However, spammers do use 423 numbers because the code is well-known and appears local to millions of residents. Always verify the specific number, not the area code.
How do I block 423 spam calls?
You cannot legitimately block an entire area code without also blocking legitimate calls from Chattanooga. Better options: register on the National Do-Not-Call list, enable your carrier's spam-filter (all major US carriers now offer this free), and report unwanted calls to the FCC at fcc.gov/complaints so they show up in the trend data on this page.
What's the overlay area code for 423?
423 shares coverage with overlay code 729. That means new phone numbers issued in the same geographic area may have either area code, and 10-digit dialing is required.
Sources
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