Data attributions

This page collects the credits and licence notices for the third-party open-source and open-data components used in parts of the Acuris website and demo tools.

Royal Mail PAF® (UK addresses)

Acuris's UK address validation, UK postcode lookup and related UK services are built using the Royal Mail Postcode Address File (PAF®) under licence. Acuris GmbH is a licensed Royal Mail PAF® Solutions Provider.

Contains PAF® data. © Royal Mail copyright and database right 2026.
PAF® and Royal Mail are registered trademarks of Royal Mail Group Ltd.

Use of UK address data returned by Acuris is subject to the Royal Mail PAF® End User Terms. Further licence information is published by Royal Mail at poweredbypaf.com.

Ordnance Survey (UK UPRN)

Where Acuris returns a UPRN (Unique Property Reference Number) for UK addresses, that identifier is derived from OS Open UPRN, published by Ordnance Survey under the Open Government Licence v3.0.

Contains OS data © Crown copyright and database right 2026.

ONS National Statistics UPRN Lookup (UK enrichment)

The free UK geographic enrichment block — output area, LSOA, MSOA, local authority, ward, Westminster parliamentary constituency, region, country, rural–urban classification and police force area — is derived from the National Statistics UPRN Lookup (NSUL), published by the Office for National Statistics on the Open Geography Portal under the Open Government Licence v3.0, and joined to the UPRN already returned with each UK address.

NSUL covers Great Britain only. Northern Ireland addresses validate normally but carry no enrichment block: Northern Ireland statistical geography is licensed separately by Land & Property Services and is not included here.

Contains OS data © Crown copyright and database right 2026.
Contains Royal Mail data © Royal Mail copyright and Database right 2026.
Contains GeoPlace data © Local Government Information House Limited copyright and database right 2026.
Source: Office for National Statistics licensed under the Open Government Licence v.3.0.

OpenStreetMap

The interactive map previews shown on Acuris demo dashboards (e.g. the validation and geocoding test forms) render their street base-map tiles from the OpenStreetMap tile network. Map data © OpenStreetMap contributors, available under the Open Database License (ODbL).

Esri World Imagery (satellite base map)

When the demo map previews are switched to satellite view, the aerial / satellite base-map tiles are rendered from Esri World Imagery. Tiles © Esri — Source: Esri, Maxar, Earthstar Geographics, USGS, AeroGRID, IGN, USDA FSA, Microsoft, and the GIS User Community.

swisstopo (Switzerland addresses)

Acuris's address validation and geocoding for Switzerland is built on the Amtliches Verzeichnis der Gebäudeadressen (Official directory of building addresses), published as free open government data by the Federal Office of Topography swisstopo. Liechtenstein addresses are included from the Swiss Post addressing directory.

Contains data from the official Swiss building-address directory. © swisstopo

swisstopo geodata is provided for free open use; the only condition is acknowledgement of the source. See swisstopo — official building-address directory.

ANNCSU — Italy (address coordinates)

Part of Acuris's Italian address validation and geocoding incorporates civic-address coordinates from ANNCSU (Archivio Nazionale dei Numeri Civici delle Strade Urbane), the national archive of street addresses and civic numbers published by ISTAT and the Agenzia delle Entrate, used under the Creative Commons Attribution 4.0 licence.

Contains ANNCSU data © ISTAT / Agenzia delle Entrate, licensed under CC BY 4.0. The data has been modified: coordinates are matched to Acuris address records and converted into the Acuris response format.

INE, Município de Cascais & Município de Oeiras — Portugal (address points)

Part of Acuris's Portuguese address validation and geocoding incorporates address points from the Base Nacional de Moradas published by the Instituto Nacional de Estatística, I.P. (INE), used under the Creative Commons Attribution 4.0 licence, and door-number points for the municipality of Cascais published by the Câmara Municipal de Cascais (GeoCascais, “Números de Polícia”) under the Creative Commons Attribution licence, and door-number points for the municipality of Oeiras published by the Câmara Municipal de Oeiras (Dados Abertos de Oeiras, “Toponímia: Números de Polícia”) under the Creative Commons Attribution licence.

Contains data from Instituto Nacional de Estatística, I.P. (Base Nacional de Moradas), licensed under CC BY 4.0.

Contains data from Câmara Municipal de Cascais (GeoCascais — Números de Polícia), licensed under Creative Commons Attribution (CC BY). Source: dadosabertos.cascais.pt.

Contains data from Câmara Municipal de Oeiras (Dados Abertos de Oeiras — “Toponímia: Números de Polícia”), licensed under Creative Commons Attribution (CC BY); listed as CC BY 4.0 on dados.gov.pt. Source: https://oeirasinterativa.oeiras.pt/dadosabertos/dataset/toponimia-numeros-de-policia. The data has been modified: coordinates converted from ETRS89/PT-TM06 (EPSG:3763) to WGS84 and matched to Acuris address records.

The data has been modified: points are matched to Acuris address records, street names are normalised, and coordinates are converted into the Acuris response format.

Kartverket — Norway (address reference data)

Acuris's address validation, autocomplete and geocoding for Norway are built on Matrikkelen — Adresse, the official address register published as open data by Kartverket (the Norwegian Mapping Authority) through Geonorge.

Contains data from Kartverket (Matrikkelen — Adresse), licensed under CC BY 4.0. The data has been modified: addresses are merged into Acuris's reference database, street and place names are normalised, access-point coordinates are derived, and coordinates are converted into the Acuris response format.

HMS — Iceland (address reference data)

Acuris's address validation, autocomplete and geocoding for Iceland are built on Staðfangaskrá, the official address register published as open data by Húsnæðis- og mannvirkjastofnun (HMS, the Housing and Construction Authority of Iceland).

Byggir á upplýsingum frá HMS. (Based on information from HMS, Staðfangaskrá, reused under the Icelandic terms for reuse of public-sector information.) The data has been modified: addresses are merged into Acuris's reference database, duplicates are removed, street and place names are normalised, and coordinates are converted into the Acuris response format.

Icelandic postal place names (póststöðvar) for each postcode come from the official postcode register (póstnúmeraskrá) published by Byggðastofnun (Icelandic Regional Development Institute).

Byggt á gögnum frá Byggðastofnun. (Based on data from Byggðastofnun.) Dative forms, PO-box flags and spelling variants are derived by Acuris.

CartoCiudad & Catastro — Spain (address coordinates)

Acuris's Spanish address validation and geocoding incorporates address entrance points from CartoCiudad, published by the Instituto Geográfico Nacional (IGN), and building coordinates derived from the INSPIRE services of the Dirección General del Catastro.

© Instituto Geográfico Nacional de España (CartoCiudad). Information derived from the Dirección General del Catastro (sedecatastro.gob.es). The data has been modified: points are matched to Acuris address records and joined to building geometry.

Department of Posts & GeoNames — India (address coordinates)

Acuris's Indian address validation and geocoding is being extended to draw postal-locality coordinates from the All India Pincode Directory, published by the Department of Posts, Government of India, and populated-place coordinates from GeoNames. The required licence acknowledgements are published here in advance of that data reaching production.

Contains information from the All India Pincode Directory, Department of Posts, Government of India, published under the Government Open Data Licence – India (GODL): data.gov.in/government-open-data-license-india.
Contains data from GeoNames (https://www.geonames.org), licensed under CC BY 4.0.

Overture Maps — India (landmark coordinates)

Acuris's Indian address validation and geocoding is being extended to place an address near a landmark the caller themselves names ("opposite Swami Samarth Math", "near City Mall") when the address itself resolves no further than a postcode or locality. The named places behind that lookup come from the Overture Maps Foundation places data. A result produced this way is labelled landmark_proximity and names the landmark it used. The acknowledgement is published here in advance of that data reaching production.

Contains data from the Overture Maps Foundation (release 2026-07-22.0), licensed under the Community Data License Agreement – Permissive, Version 2.0 (CDLA-Permissive-2.0). The data has been modified: places are normalized, matched to Indian PIN codes and converted into the Acuris response format.

Overture Maps — Singapore (shop and tenant names)

Singapore address autocomplete and validation recognise the names of shops and other tenants of a building. Part of those names contains data from the Overture Maps Foundation places data, licensed under the Community Data License Agreement – Permissive, Version 2.0 (CDLA-Permissive-2.0); portions are data from Foursquare, licensed under the Apache License, Version 2.0 and reproduced with the notice below, and portions are data from AllThePlaces, available under CC0 1.0. The data has been modified: place names are normalized and matched to Singapore postal addresses.

Foursquare OS Places Notice
© 2026 Foursquare Labs, Inc. All rights reserved.
The Foursquare OS Places dataset (the “Data”) is licensed under the Apache License, Version 2.0 (the “License”). You may not use, modify, or distribute the Data except in compliance with the License.
As set forth more fully in the License, if you use, modify, or distribute the Data, you must: – provide recipients with a copy of the License. – if applicable, include prominent notices to the extent you’ve changed the Data. – preserve attribution to Foursquare, including preserving the full content of this NOTICE.txt file.
To ensure appropriate attribution to Foursquare, we recommend the following: – if using/distributing the Data in flat file form as-is or after making changes/modifications: include this NOTICE.txt file, which may be modified to include an additional notice of your changes/modifications, if any. – if using/distributing the Data in API form as-is or after making changes/modifications: include a copy of the content from this NOTICE.txt file prominently in your developer documentation for such API, which may be modified to include an additional notice of your changes/modifications, if any.
You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0. Unless required by applicable law or agreed to in writing, the Data distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Modifications by Acuris: place names are normalized and matched to Singapore postal addresses.

United States address points (free government sources)

Part of the United States address coverage is built from address points that U.S. federal, state, county and parish authorities publish for public use. The sources are credited below. Acuris uses them as reference data to check, complete and locate addresses; the datasets themselves are not resold or republished. The data has been modified: street names are normalized, ZIP codes and place names are completed where the source leaves them out, and each point is converted into the Acuris response format.

National Address Database (NAD) — U.S. Department of Transportation. U.S. Government work, public domain (17 U.S.C. 105); an acknowledgement is requested, not required.

Address points from the National Address Database (NAD), U.S. Department of Transportation, compiled from state and local address authorities.

State of Colorado — Colorado Office of Information Technology (OIT), Public addresses. Commercial use is permitted with this attribution; resale of the dataset is not permitted and is not done.

State of Colorado Public addresses were accessed on 16 October 2026 from https://gis.colorado.gov/public/rest/services/Address_and_Parcel

Minnesota Geospatial Information Office (MnGeo) — address points compiled by MnGeo from opt-in open counties (loc_addresses_open). MnGeo data may be used for any purpose, provided as is without warranty.

NM911 — NM911 Address Points, New Mexico Department of Finance and Administration 911 Program, distributed by UNM EDAC RGIS; no access or use constraints.

County and parish address authorities. In the areas below the address points come directly from the local addressing or 911 authority:

Official enrichment sources (free geography & demographics)

The free enrichment block that Acuris attaches to validated addresses in supported countries is derived from the following official open-data sources. Each API response containing enrichment also carries its own source acknowledgement.

Licence summary

Acuris API outputs for most countries (validated addresses, coordinates) are produced from Acuris's own reference database and do not carry a third-party attribution requirement. The exceptions are noted above: UK results incorporate Royal Mail PAF® and Ordnance Survey data, Swiss results incorporate swisstopo building-address data, United States results incorporate the address-point sources listed in the United States section above, Italian results incorporate ANNCSU civic-address coordinates (© ISTAT / Agenzia delle Entrate, CC BY 4.0), Portuguese results incorporate INE Base Nacional de Moradas (CC BY 4.0) and Câmara Municipal de Cascais and Câmara Municipal de Oeiras door-number data (CC BY), Spanish results incorporate CartoCiudad (© IGN) and Catastro-derived coordinates, Icelandic results incorporate HMS Staðfangaskrá data (“Byggir á upplýsingum frá HMS”) and Byggðastofnun postal place names (“Byggt á gögnum frá Byggðastofnun”), the free enrichment blocks incorporate the official statistical and boundary sources listed above, and the rendered base-map tiles on demo pages carry the OpenStreetMap (street) and Esri World Imagery (satellite) attributions. The All India Pincode Directory (© Department of Posts, Government of India, GODL), GeoNames (CC BY 4.0) and Overture Maps Foundation (CDLA-Permissive-2.0) acknowledgements above are published ahead of that data's production rollout for India. Questions: support@acuris-geo.com.

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