About NetScanAI US

A free tool that compares AT&T, T-Mobile and Verizon coverage for any US ZIP code, state or large city, using the coverage each carrier files with the FCC, shown exactly as the FCC publishes it.

What it does

ZIP code checker

Enter a ZIP code and see how much of your town, or your county if the ZIP is mostly outside a town, each carrier reports covering.

State and city pages

All 50 states and DC, and the 300 largest US cities by the Census Bureau's 2024 population estimates.

Free, no sign-up

No account and nothing behind a paywall. Links to carriers are plain links: no carrier pays us, and none can change the order they appear in.

US only

The 50 states and the District of Columbia. US territories are in the FCC data but not on the site yet.

Where the numbers come from

Twice a year, every mobile carrier in the US must file maps with the FCC showing where it offers 4G LTE and 5G service. The FCC publishes them as the National Broadband Map, along with summary files giving, for every state, county and Census place, the share of its area inside each carrier's filing. NetScanAI shows those shares as they are. We don't run our own signal measurements, and we don't adjust, weight or smooth the FCC's figures.

The figures on the site are from the filing as of December 31, 2025, which the FCC published on September 15, 2026. We rebuild the site's data when the FCC publishes a new filing.

OUTDOOR

Phone standing still outside

The share of the area where the carrier reports 4G LTE or 5G to a phone outdoors and not moving. This is the headline number on every page.

IN CAR

Phone in a moving vehicle

The share where the carrier reports service to a phone in a moving car. It is always lower than the outdoor figure, and it often separates carriers where the outdoor figures tie.

Two 5G speed tiers

The FCC publishes 5G at two minimum speeds, 7/1 Mbps and 35/3 Mbps. Its place summaries give these across all carriers combined, not per carrier, so that is how we show them.

RANKING

Ties are called ties

Carriers are ordered by outdoor coverage. When all three are within 5 points of each other we say no carrier wins, rather than crown one on a difference too small to matter.

WATER

Lakes and coast count as area

The FCC's area includes water, and some carriers file coverage over water while others don't. In New York City, 36% water, AT&T's figure is roughly the city's land. So we only call a lead real when it is bigger than the share of the place that is water, using the Census Bureau's land and water areas.

How a ZIP code is answered

ZIP codes are mail routes, not areas, so the FCC does not publish figures for them. We use the Census Bureau's ZIP Code Tabulation Areas and its 2020 relationship files to find the Census place (town or city) covering most of the ZIP's land. If a place covers at least half of it, you see that place's figures. Otherwise you see the county that covers most of it. Every result states which one you're looking at. A PO-box-only ZIP has no land area of its own, so it gets no result.

What the figures can't tell you

They are the carriers' own claims

The maps are filed by the carriers. The public can challenge them through the FCC, but they are not drive tests. A carrier's filing can be more generous than the signal you get.

Area, not people

A share of area counts a mountainside the same as a downtown block. A city at 100% can still have a weak street, and a state at 40% may cover almost everyone who lives there.

No indoor figure

The filing covers outdoors and in a car. Signal inside a building is often weaker than both, and depends on the building.

Other brands ride these networks

Most prepaid and discount brands run on one of these three networks, and their coverage is that network's. Smaller regional carriers file with the FCC too, but aren't ranked here.

So check the carrier's own map for your exact address before you switch. Every coverage page links to all three.

Data sources

FCC National Broadband Map, Broadband Data Collection public downloads: Provider Summary by Geography Type, Mobile Broadband Summary by Geography Type and Provider Summary for Mobile Broadband (Biannual December 31, 2025 filing, as of December 31, 2025).
US Census Bureau, Vintage 2024 city and town population estimates (SUB-EST2024), used to pick the 300 largest cities.
US Census Bureau 2020 ZCTA-to-place and ZCTA-to-county relationship files, used to match 33,573 ZIP codes to a place or county.

NetScanAI US is built and maintained by Cezary Makulec, who also runs NetScanAI in the UK.

Privacy

Visits are counted with Cloudflare Web Analytics, which sets no cookies and builds no profile of you. It records the page visited, the referrer and rough country — nothing that identifies a person. That is why this site shows no cookie banner: there is nothing to consent to.

A ZIP code you type is answered from data already loaded on the server. It goes into no database and is never tied to you — it appears only in the hosting platform's ordinary request logs, which expire on their own. There is no sign-up, no account and no newsletter.