| Dataset | Licence | Notice |
|---|
| GeoNames | CC BY 4.0 | Contains data from GeoNames (countryInfo, cities15000), licensed under Creative Commons Attribution 4.0. Country codes, capitals and capital coordinates, area, population, TLDs, calling codes, postal-code formats, languages and neighbours. |
| Unicode CLDR 49 | Unicode License v3 | Copyright © 1991-2026 Unicode, Inc. M49 regions, ISO 3166-2 subdivision codes and English names, currency minor units, weekend and first-day-of-week data, measurement systems, language data; localized names via the runtime ICU data. |
| IANA Time Zone Database 2026f | Public domain | zone.tab (zones per country, coordinates, comments); offsets and DST rules via the runtime ICU data. |
| OurAirports | Public domain | Airport names, IATA/ICAO codes, municipalities, coordinates, elevation and type (download 2026-10-30). |
| timezone-boundary-builder (via geo-tz) | ODbL 1.0 (data), MIT (geo-tz) | Airport time zones were derived from the airport coordinates with the time-zone boundaries of timezone-boundary-builder © Evan Siroky and contributors, made available under the Open Database License 1.0. |
| Wikidata | CC0 1.0 | Representative country coordinates (property P625). |
| date-holidays | ISC (code), CC BY 3.0 (holiday data) | Holiday rules © commenthol and contributors, licensed under Creative Commons Attribution 3.0. |
| libphonenumber metadata (via libphonenumber-js) | Apache-2.0 (metadata), MIT (libphonenumber-js) | Copyright Google LLC and Nikolay Kuchumov. Calling codes, trunk and international prefixes, example numbers. |
| European Central Bank euro foreign exchange reference rates | ECB reuse policy: free reuse with source attribution | Source: European Central Bank. Reference rates are published for information purposes only; cross rates are derived by this API. |