OS Open Linked Identifiers

OS Open Linked Identifiers provides authoritative relationship between UPRNs, USRNs, TOIDs and meta data to enable reliable matching; for greater data connectivity.

  • Identifiers
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  • OS OpenData Plan (FREE)
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This product is updated every six weeks

Representation of data provided
Representation of data provided
© Crown copyright and database rights. Ordnance Survey 2024

What OS Open Linked Identifiers provides you with

Relationships between UPRNs, USRNs and TOIDs

OS Open Linked Identifiers is a dataset containing the authoritative relationships between Unique Property Reference Numbers (UPRNs), Unique Street Reference Numbers (USRNs) and Topographic Object Identifiers (TOIDs). Watch our OS Open Linked Identifiers introduction video.

Better visualisation

Connecting addresses with road features enables more related data to be joined together which simplifies a number of valuable workflows. Linking these features to graphical elements of OS MasterMap products enables better visualisation of the data related to them.

Find all addresses on a road

Link data related to an address with its building footprint. Validate an addresses UPRN with the name of the road that accesses it. Validate a streets USRN with the name of the road it relates to.

Authoritative source

The relationships UPRN and USRN are provided by the bodies responsible for the identifier schemes; and these are spatially matched to OS MasterMap features by Ordnance Survey. This means you can have confidence you're accessing an authoritative source of these relationships.

Relationships you can trust

The relationships are taken from our premium data products and being made open for the so everyone can access them from one trusted source.

OS Open Linked Identifiers

Technical information

© Crown copyright and database rights. Ordnance Survey 2024


Use cases

The OS Open Linked Identifiers product provides the valuable relationships between the following features found in OS MasterMap products (TopographicAreas limited to address and road features):

  • TopographicArea* (TOID): OS MasterMap Topographic Layer
  • RoadLink(TOID): OS MasterMap Highways Networks – Roads
  • Road(TOID): OS MasterMap Highways Networks – Roads
  • ORRoadLink/ORRoadNode(GUID): OS Open Roads
  • Street(USRN): OS MasterMap Highways Networks – Roads
  • BLPU(UPRN): AddressBase Premium

*restricted to address and road features.

  • Download
Data theme
  • Multiple
Data structure
Vector - Identifiers
Great Britain
1:1250 to 1:10,000
  • CSV
Ordering area
  • All of Great Britain
OS Data Hub plan
  • Energy & Infrastructure Plan
  • OS OpenData Plan (FREE)
  • Premium Plan
  • Public Sector Plan

Documents and Support

Getting started guides

  • OS Open Linked Identifiers - Getting started guide
    The getting started guide provides instructions for using the product in different software applications. Users with limited technical knowledge will be able to follow this guide.
    1 mb
    July 1, 2020

Technical specification

Supporting documents

  • OS Open Linked Identifiers - Overview
    The overview introduces the product and gives context for all users. It highlights key features, provides examples of potential uses for the product and lists details like file sizes, supply formats, etc.
    3.2 mb
    September 21, 2020

Release notes

Additional information

Identifier version information

Open Linked Identifiers includes the latest version information for all the respective features that are referred to. In some cases, this might be a different version of the feature than what was used to form the relationship. This means that in some cases the relationship might not still be valid. To help resolve this we’ve also included a confidence value, indicating if the feature has changed since the relationship was formed, which can be used to resolve errors.

Geometry and attribution access

 Geometry is not included in OS Open Linked Identifiers. You can get the geometry you need from either OS Open UPRN, OS Open USRN or OS Open TOIDs.


OS Open Linked Identifiers does not contain UDPRN, as there is 3rd party IP associated with the UDPRN.

OS Open Linked Identifiers

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What you get

Key features
  • Relationships between UPRNs, USRNs and TOIDs
  • Better visualisation
  • Find all addresses on a road
  • Authoritative source
  • Relationships you can trust
  • Download
Data structure
Vector - Identifiers
Update frequency
Every six weeks

How to access

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