523 Area Code — Non-geographic Code
Area code 523 is a non-geographic code, not tied to any state in the Eastern time zone, in service since 2018. Consumers have filed 120 unwanted-call complaints against 115 different 523 numbers, 1 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 523 at a glance
- Type
- Non-geographic (no fixed location)
- Local time
- —Eastern
- In service since
- November 13, 2018
- Overlay of
- 500
- Overlay codes
- 533 (2009), 566 (2012), 588 (2015), 522 (2016), 521 (2017), 524 (2019), 525 (2020), 526 (2021), 527 (2021), 528 (2022), 529 (2022), 532 (2024), 538 (2025), 542 (2026), 543 (2026)
- Local dialing
- 10 digits (area code + number)
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 523 numbers
No single 523 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
Is it getting worse?
FCC complaints about 523 numbers peaked in 2018 (96); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
What to do about calls from 523 numbers
Before you call back
- Medical & prescriptions is the top named complaint here. Don't confirm your Medicare or insurance number to a caller. Medicare won't cold-call you to sell braces, test kits or plans. Read about Medicare scam calls.
- Look up the full number above. A missed call from 523 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 523: questions answered from the data
Where is area code 523?
Area code 523 is not tied to a location. It is a non-geographic code reachable from anywhere in the North American Numbering Plan, so the digits say nothing about where the caller is.
What time zone is area code 523 in?
Area code 523 is in the Eastern time zone (UTC−5, or UTC−4 during daylight saving time). The current local time is shown at the top of this page.
Which area codes overlay 523?
533 (in service 2009), 566 (in service 2012), 588 (in service 2015), 522 (in service 2016), 521 (in service 2017), 524 (in service 2019), 525 (in service 2020), 526 (in service 2021), 527 (in service 2021), 528 (in service 2022), 529 (in service 2022), 532 (in service 2024), 538 (in service 2025), 542 (in service 2026) and 543 (in service 2026) serve the same area as 523. New numbers there can be issued with any of these codes, and local calls need all 10 digits. A spoofed call can display any of them.
How do I report a 523 scam call?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. Reports feed the public data this page is built from.
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.