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Ordnance Survey

OS Linked Identifiers API

Resolves the relationships between properties, streets, and OS MasterMap identifiers - UPRN to TOID to USRN - which is the join key between OS data, HM Land Registry records, and local authority property data.

Documentation Provider Profile APIs.io OpenAPI GitHub

OS Linked Identifiers API is one of 12 APIs that Ordnance Survey publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Identifiers, UPRN, TOID, and Property Data. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 4 operations across 4 paths, and defines 7 schemas. It is described by OpenAPI 3.0.0, at version 1.0.0.

Requests are made against a single base URL, https://api.os.uk/search/links/v1.

4 operations 4 paths 7 schemas 4 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.0
API Version
1.0.0
Base URL
https://api.os.uk/search/links/v1
Authentication
API Key, OAuth 2.0
Resource Areas
1

Authentication & Security 2

OS Linked Identifiers API declares 2 security schemes for authenticating requests. An API key is passed in the query as key (ApiKeyAuth). It supports OAuth 2.0 (OAuth2) using the clientCredentials flow, exposing 1 scope. By default, every request must be authenticated.

Paths & Operations 4

Across 4 paths, the API surfaces 4 operations — 4 GET. Each is listed below with its method, path, parameters, and response codes.

OS OpenData Users 4

Operations available to customers using the OpenData plan

GET
/featureTypes/{featureType}/{id}
Query ID when input featureType is known
2 params → 200400401403404405429500
GET
/identifierTypes/{identifierType}/{id}
Queries ID when input identifierType is known
2 params → 200400401403404405429500
GET
/identifiers/{id}
Query identifer
1 param → 200400401403404405429500
GET
/productVersionInfo/{correlationMethod}
Returns product version details of the source data products
1 param → 200400401403404405429500

Schemas 7

The contract defines 7 schemas that model the data the API accepts and returns. The most detailed are identifierSource (5 properties), correlationMethodInformation (5 properties), linkedIdentifier (2 properties), linkedIdentifierSet (1 property). Each schema is shown below with its type and property counts.

linkedIdentifier
object
2 properties 2 required
featureType
string
identifierType
string
correlationMethodIdentifier
string
linkedIdentifierSet
object
1 property 1 required
correlationMethodInformation
object
5 properties 4 required
identifierSource
object
5 properties 4 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

ordnance-survey-linked-identifiers-openapi.json Raw ↑

Other APIs Ordnance Survey publishes across the network.

OS NGD API - Features
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OS NGD API - Tiles
AE Profile APIs.io
OS Downloads API
AE Profile APIs.io
OS Net API
AE Profile APIs.io
OS Places API
AE Profile APIs.io
OS Names API
AE Profile APIs.io
OS Match & Cleanse API (withdrawn)
AE Profile APIs.io
OS Features API
AE Profile APIs.io
OS Maps API
AE Profile APIs.io
OS Vector Tile API
AE Profile APIs.io
OS OAuth 2 API
AE Profile APIs.io
#Identifiers#UPRN#TOID#Property Data
← Back to O APIs
API Details
ID
ordnance-survey:os-linked-identifiers-api
Base URL
https://api.os.uk/search/links/v1
Docs
https://docs.os.uk/os-apis/accessing-os-apis/os-linked-identifiers-api
Provider
Ordnance Survey
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