521 area code — NANP AREA non-geographic
- Scope
- Non-geographic
- Time zone
- Eastern
- In service since
- 2017-09-21
- Split from
- 500
The 521 area code covers NANP AREA, Eastern time zone, and dates back to September 21, 2017. It is part of the 500/521/522/523/524/525/526/527/528/529/532/533/538/542/544/566/577/588 overlay complex — these codes share the same territory. Note that porting and VoIP mean a 521 number can be used from anywhere — the code marks where the number was assigned.
521 was created from 500 in 2017.
If a 521 call asks for money or personal data, treat the displayed number as unverified: hang up and reach the organization through its published number. Numbering data locates numbers, not callers.
Unlike geographic area codes, 521 serves non-geographic services across the whole NANP. There is no territory, no rate centers, and no carrier prefix table to show — the code exists at the numbering-plan level only.
FAQ
Is 521 a toll-free number?
No. 521 is a non-geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Why do 500 and 521 cover the same place?
They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 500/521/522/523/524/525/526/527/528/529/532/533/538/542/544/566/577/588 complex shares one service area, and local calls are dialed with 10 digits.
Why am I getting spam calls from 521 numbers?
Scammers spoof real area codes so calls look legitimate. A displayed 521 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 521 number from?
521 is assigned to NANP AREA in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.