423 Area Code — TN
Area code 423 serves TN in the EC time zone, in service since 1995. The FCC has 148 unwanted-call complaints against 140 different 423 numbers on record. Look up the exact number that called you below.
Most-reported 423 numbers
Ranked by FCC unwanted-call complaints. Click a number for its full report.
423 unwanted-call complaints, last 12 months
Monthly FCC complaint volume against 423 numbers. Spikes usually mark an active robocall campaign cycling through the code.
About area code 423
- Serves
- TN
- Time zone
- EC
- In service since
- 1995-09-11
- Overlay
- Yes — 10-digit dialing
Source: NANPA numbering records, refreshed weekly.
Spam calls from 423? What to know
Seeing repeated missed calls from 423 numbers you don't recognize is the classic signature of neighbor-spoofing robocall campaigns. The caller isn't necessarily in TN — spoofing software displays whatever digits the campaign chooses. Never call unknown numbers back; look them up first, and report unwanted calls to the FCC to build the public record.
Area code 423 FAQs
Where is area code 423?
Area code 423 serves TN, in the EC time zone. It is part of an overlay complex, so multiple area codes serve the same territory and 10-digit dialing is required. It has been in service since 1995.
Why do I keep getting calls from 423 numbers?
Robocallers use "neighbor spoofing" — displaying a number with a local area code to make you more likely to answer. A call showing area code 423 may not originate from TN at all. Look up the full 10-digit number on this site to see its complaint history before calling back.
Are 423 numbers safe to call back?
Area codes themselves are neither safe nor unsafe — 423 contains millions of legitimate lines alongside any spoofed or spam numbers. The FCC has logged 148 unwanted-call complaints against 140 distinct 423 numbers in our current data window. Check the specific number's report page before returning a missed call.