AddressBase Premium in an API

Search the most comprehensive address database in the UK

Addresses with UPRNs   Property-level coordinates   Delivered as a web service

Address matching

Search by postcode or part of an address and return all of the matching addresses

UPRN lookup

Retrieve all of the information associated with a Unique Property Reference Number (UPRN)

Geo search

Locate properties and points of interest within range of a position or within a bounding box



An API for AddressBase Premium and AddressBase Islands

Covering Great Britain, Northern Ireland, Isle of Man and the Channel Islands


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  • Unique Property Reference Number (UPRN)
  • Royal Mail Postcode Address File (PAF®)
  • National Grid coordinates
  • Feature life cycle dates
  • Local authority addresses
  • Objects Without a Postal Address (OWPA)
  • Multiple occupancy addresses
  • Local authority streets
  • Unique Street Reference Number (USRN)
  • Street start and end coordinates
  • OS Topographic Identifier (TOID)
  • Alternative addresses
  • Provisional addresses
  • Historical addresses

what3words logo

You can now lookup 3 word location codes from what3words using UPRN, postcode or address fragment, with our AddressBase Premium API. Also search for properties using what3words instead of longitude and latitude coordinates.
Read more about Allies' partnership with what3words »



Use PostCoder Web across your business

Websites

Make half-completed addresses filled with typos a thing of the past. Capture accurate addresses from the start.

Mobile apps

Use the property-level coordinates in AddressBase Premium to highlight nearby assets to those with GPS-enabled devices.

CRMs and office systems

Help your staff spend less time typing in addresses and more time concentrating on your customers and their needs.


Use PostCoder Web across your business

A simple API for developers

Sign up for an API key and get free lookups to try

Cross platform AddressBase lookup using the PostCoder Web API

Easy to integrate examples
Secure HTTPS requests
Reporting tools and usage alerts
30ms average response time
>99.99% uptime
Enterprise SLA available

API documentation
Get your API key



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