521 Area Code — Non-geographic Code
Area code 521 is a non-geographic code, not tied to any state in the Eastern time zone, in service since 2017. Consumers have filed 48 unwanted-call complaints against 32 different 521 numbers. Look up the exact number that called you below.
Area code 521 at a glance
- Type
- Non-geographic (no fixed location)
- Local time
- —Eastern
- In service since
- September 21, 2017
- Overlay of
- 500
- Overlay codes
- 533 (2009), 566 (2012), 588 (2015), 522 (2016), 523 (2018), 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.
Most-reported 521 numbers
Ranked by FTC Do Not Call complaints this month, then all-time FTC and FCC complaints. Only numbers with enough complaints for a full report page are listed. Click one for what it was reported for and where.
What calls from 521 numbers are about
22 FTC Do Not Call complaints about 521 numbers since Jul 24. The most common named subject is impostor calls (people pretending to be a government agency, a business or family), at 73% of complaints (100% of those were recorded messages). Overall, 100% of callers who answered said the call was a robocall.
FTC complaint subjects
- Impostor (government, business, family)1673%
- Other / unspecified418%
- Debt reduction29%
Is it getting worse?
FCC complaints about 521 numbers peaked in 2015 (7); 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 521 numbers
Before you call back
- Impostor (government, business, family) is the top named complaint here. Hang up and call the agency, bank or relative back on a number you already know. Government agencies don't demand payment by gift card, wire transfer or crypto. Read about Social Security impostor calls and fake bank fraud calls.
- Look up the full number above. A missed call from 521 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 521: questions answered from the data
Where is area code 521?
Area code 521 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 521 in?
Area code 521 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 521?
533 (in service 2009), 566 (in service 2012), 588 (in service 2015), 522 (in service 2016), 523 (in service 2018), 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 521. 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.
What are calls from 521 numbers usually about?
Since Jul 24, consumers filed 22 FTC Do Not Call complaints about 521 numbers. The most common named subject was impostor calls (people pretending to be a government agency, a business or family): 73% of complaints, 100% of them recorded messages. Across all subjects, 100% of callers who answered the question said the call was a robocall.
How do I report a 521 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.