Data sources

FCC Antenna Structure Registration (ASR)

Registered structures, their locations, heights, types, owners and lighting. Published weekly by the Federal Communications Commission at data.fcc.gov.

OpenCelliD

Crowdsourced cell observations: carrier network codes, radio technology and approximate positions. Licensed CC BY-SA 4.0 by Unwired Labs, opencellid.org.

GeoNames

ZIP code centers, towns and counties used to place towers and build the ZIP pages. Licensed CC BY 4.0, geonames.org.

Address search

Turns an address you type into coordinates. Our own geocoding service looks it up in OpenStreetMap data and, for some street addresses, the U.S. Census Bureau's public geocoder. Where that address goes is set out in our privacy policy.

Basemap

OpenStreetMap data in the Protomaps format, served from our own tile server.