foneinfo.us: Free US Phone Number Lookup
Carrier, Line Type & Area Code History

Most phone lookup tools on the internet are scams dressed up as utilities. You search a number, get a wall of "PREMIUM UNLOCK REQUIRED" placeholders, and walk away knowing nothing — except that someone is trying to sell you a subscription to the same NANPA data that is publicly available for free.

So I built foneinfo.us. No signup. No logging. No subscription wall. Enter any US phone number, area code, or NPA-NXX prefix and get real data back instantly.

What foneinfo.us Tells You

The tool pulls from NANPA — the North American Numbering Plan Administrator, which is the official body that governs how US phone numbers are assigned. This is the same data source used by telecom carriers and regulatory agencies. The difference is that most people don't know how to navigate NANPA's raw databases, and the sites that package it up nicely charge you for the convenience.

Here's what you get for any US number or NPA-NXX prefix:

How to Use It

Go to foneinfo.us and enter:

• A full 10-digit US phone number (e.g., 504-555-1234)
• Just an area code (e.g., 504)
• An NPA-NXX prefix — the first 6 digits (e.g., 504-555)

Results come back immediately. No loading spinners, no "we're searching our database" theater. The data is local and fast.

What Is NPA-NXX and Why Does It Matter?

In the North American Numbering Plan, every 10-digit US phone number has this structure:

The NPA-NXX combination (first 6 digits) is the key unit. NANPA assigns number blocks at the NPA-NXX level — meaning an entire block of 10,000 numbers (0000–9999) with the same 6-digit prefix is assigned to a single carrier. That's how foneinfo.us knows the carrier and line type for any number: it looks up the NPA-NXX block that number belongs to.

This is also why the carrier shown is the registered block holder, not necessarily the carrier your contact is currently using. If someone ported their number from AT&T to T-Mobile, the NPA-NXX data still shows AT&T as the original block holder. That's a limitation of any tool working from this data — ported numbers require a real-time dip into the NPAC (Number Portability Administration Center), which is a paid service. foneinfo.us uses the free public data.

Who Builds This Stuff?

foneinfo.us is one of several utility tools I've built and maintain at VARØ Industries. The pattern is the same across all of them: there's a useful data source or calculation that's publicly available or derivable, some existing tool makes it needlessly complicated or paywalled, so I build a clean version that just works.

Other tools in the same spirit: GotInfo shows everything your browser exposes about your network connection, and AirportCode does deep lookup on any airport by IATA/ICAO code including live METAR weather. All free. All no-account.