Free Reverse Phone Lookup - Who Called Me? | USACallerLookup

# USACallerLookup > Free reverse phone lookup for US numbers. Every number page combines NANPA carrier and > rate-centre data with Federal Trade Commission Do Not Call complaint records and reports left > by visitors, so a caller can be identified by what is actually on record rather than by guesswork. US phone numbering is public information and FTC complaint data is US public domain. This site structures both so a specific question about a specific number has a specific answer. ## Data sources - **NANPA / North American Numbering Plan**: 197,876 NPA-NXX prefixes across 364 area codes, giving carrier, line type, rate centre, city and state for any US number. - **FTC Do Not Call complaint data**: published every weekday by the Federal Trade Commission and released into the US public domain. Ingested daily. Provides complaint counts, the states complainants filed from, reported subject categories and robocall flags. - **Visitor reports**: free-text reports submitted on the site, moderated before display. ## How to read what is here - Complaint counts describe **records filed against a number**, not proven wrongdoing. - Caller ID is trivially forged. A number appearing in complaints may belong to an uninvolved person whose number was spoofed by someone else. Language on the site reflects this and so should any summary of it. - Figures are stated with the date range they cover, because complaint volumes move quickly. - Numbers with no prefix data, no complaints and no visitor reports are intentionally excluded from the index rather than published as empty pages. ## Key pages - [Homepage and lookup](https://www.usacallerlookup.com/): search any US number - [Area code directory](https://www.usacallerlookup.com/state-area-codes/): every US area code by state - [Data sources](https://www.usacallerlookup.com/data-sources/): full provenance and update cadence - [FAQ](https://www.usacallerlookup.com/faq/): how the data works and what it can and cannot tell

{ "openapi": "3.1.0", "info": { "title": "USACallerLookup Free Phone Lookup API", "version": "1.0.0", "summary": "Free, no-key JSON API for US phone numbers: carrier, location and FTC robocall complaint history.", "description": "A free, read-only JSON API over US phone numbering data and FTC Do Not Call complaint records. No API key, no sign-up, no cost.\n\nData sources: the NANPA numbering registry (carrier, city and state per NPA-NXX prefix) and FTC Do Not Call complaint d