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description=PostcodeTools provides a powerful API for Dutch address data from the BAG register. 46 endpoints, 10.7 million+ addresses, updated monthly from Kadaster.;

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postcodetools dutch address data api the dutch address api postcodetools skip to main content postcodetools explore documentation contact theme language log in register theme language bag basic registry the dutch address api access 10 6 million addresses from the bag with one simple api geocoding building data and more get started free view documentation 10 7m addresses 46 api endpoints 99 9 uptime 50ms response time how it works get up and running in three simple steps 1 create an account register for free in under a minute no credit card required 2 get your api key generate an api key from the dashboard and copy it to your application 3 start querying send your first request and receive structured dutch address data in json api easy to integrate create an api key send a request and receive structured address data it s that simple view documentation curl python php javascript response curl x get https postcodetools nl api v1 addresses lookup postcode 1012js number 1 h authorization bearer your_api_key h accept application json import requests response requests get https postcodetools nl api v1 addresses lookup params postcode 1012js number 1 headers authorization bearer your_api_key data response json print data street data city response http withtoken your_api_key get https postcodetools nl api v1 addresses lookup postcode 1012js number 1 address response json echo address street address city const response await fetch https postcodetools nl api v1 addresses lookup postcode 1012js number 1 headers authorization bearer your_api_key const data await response json console log data street data city data postcode 1012js house_number 1 street dam city amsterdam municipality amsterdam province noord holland latitude 52 3731 longitude 4 8932 try it live test the api right now no account needed enter a dutch postcode and house number to see a live response postcode number try it response enter a postcode and click try it to see the response public demo is rate limited to 10 requests per minute everything you need powerful features for every use case address lookup look up any dutch address by postcode and house number includes street city municipality and province geocoding convert addresses to coordinates wgs84 and rijksdriehoek and vice versa with high accuracy building data construction year area purpose and geometry of every building in the netherlands via bag pand id batch requests look up up to 100 addresses at once in a single request ideal for data enrichment and migrations webhooks receive real time notifications for quota warnings spikes and expiring api keys full text search search the entire address database with free text autocomplete and fuzzy matching included built for every industry from real estate to logistics postcodetools fits your workflow real estate automatic address validation and building data for appraisals and listings logistics route optimization and address verification for faster delivery financial services kyc address verification and risk assessment based on location data government official bag data for policy permits and statistics trusted reliable built on official government data with enterprise grade reliability official bag data sourced directly from the kadaster s basic registration of addresses and buildings updated daily gdpr compliant fully compliant with european privacy regulations your data is secure and processed within the eu lightning fast average response times under 50ms with 99 9 uptime built for high volume production use ready to get started create a free account and start retrieving dutch address data within minutes create free account postcodetools the most complete api for dutch address data from the bag product api documentation getting started resources contact faq register legal privacy policy terms of service cookie policy 2026 postcodetools all rights reserved data sourced from the basic registration of addresses and buildings bag by kadaster