Data sources and licences

The sources

Source	Used for	Licence
National Address Database (US DOT)	Rooftop and parcel address points	Public domain
OpenAddresses, selected US sources	Address points where NAD has gaps	Only sources without share-alike terms are included
TIGER/Line (US Census Bureau)	Street segments with house-number ranges; place, county, state and ZCTA boundaries; tracts and block groups; congressional, state legislative and school district boundaries	Public domain
timezone-boundary-builder	IANA time zone polygons	ODbL (derived from OpenStreetMap), served as a produced work with attribution
DB-IP City Lite	IP geolocation	CC BY 4.0

There is no OpenStreetMap data in the address index. The map tiles on this website, and in maps made with the map embed generator, come from OpenFreeMap (OpenStreetMap data, ODbL). They are credited on the map and on exported images, and they are not part of the API.

What "you can keep the results" means

Coordinates, standardised addresses and appended geographies returned by the API are derived from public-domain data, and no licence we hold obliges you to delete, refresh or share them. You may store them for as long as you like, in any system, on every plan. The time zone and IP results are produced works from attributed sources; keeping and using them is fine, redistributing the underlying databases is not.

Attribution

If you display IP geolocation or time zone results publicly, carry these lines somewhere reasonable, such as a footer or an about page:

• IP Geolocation by DB-IP, https://db-ip.com, CC BY 4.0
• Time zone boundaries from timezone-boundary-builder, ODbL

Current index

The API's /health endpoint reports the exact release of each source in the live index. At the time of writing: National Address Database release r24 (September 2026), TIGER/Line 2025, DB-IP October 2026.