---
title: Not All UPRN Data Is the Same
description: Learn the difference between open UPRN identifiers, the ONS UPRN Directory, and OS AddressBase, and find out which source is right for your use case.
image: https://blog.ideal-postcodes.co.uk/hubfs/A%20top-down%20shot%20of%20a%20residential%20area%20with%20clearly%20defined%20rooftops%20and%20location%20pins%20on%20a%20few%20of%20them.jpg
---

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# Not All UPRN Data Is the Same

Understanding UPRN data sources: open identifiers, free directories, and licensed address data

![hero-jobbies-7](https://f.hubspotusercontent00.net/hubfs/395201/hero-jobbies-7.svg)

[Doaa Kurdi](https://blog.ideal-postcodes.co.uk/author/doaa-kurdi)

 Apr 1, 2026, 8:59:59 AM

> Understanding UPRN data sources: open identifiers, free directories, and licensed address data

![Connect every premise - Header](https://blog.ideal-postcodes.co.uk/hs-fs/hubfs/Connect%20every%20premise%20-%20Header.png?width=297&height=297&name=Connect%20every%20premise%20-%20Header.png)

If you've spent any time working with UK address data, you've probably come across the term UPRN. It comes up in conversations about property, planning, utilities, emergency services, and increasingly, about data quality.

But having access to a UPRN doesn't automatically mean you have access to useful address data. The identifier itself is one thing. The data that surrounds it is quite another.

 

## What Is a UPRN?

UPRN stands for [Unique Property Reference Number.](https://ideal-postcodes.co.uk/uprn) It's a numerical identifier assigned to every addressable location in Great Britain, from a house or flat to a business premises, a piece of land, or a telephone box.

The number was developed by Ordnance Survey and is maintained as part of a broader system of geographic reference data. Each UPRN is permanent and consistent across different datasets and systems, which makes it a useful common thread when organisations need to link records together. A local authority, a [utility provider](https://ideal-postcodes.co.uk/sector/utilities), and a national health service could all hold data on the same property and, if they all reference the same UPRN, they can match those records.

## Three Layers of UPRN Data

Access to [UPRN](https://ideal-postcodes.co.uk/guides/uprn) data comes through different channels, each with different coverage, currency, and conditions of use. Understanding the differences helps you make better decisions about which source is right for your use case.

 

### The UPRN Identifier Itself: Free and Open Since 2020

In 2020, as part of the UK government's open data agenda, Ordnance Survey released the UPRN identifiers themselves as open data. This means anyone can use, share, or build with a UPRN without needing a licence.

The open release covers two datasets: Open UPRN and Open USRN ([Unique Street Reference Number](https://ideal-postcodes.co.uk/guides/usrn)). These are simple CSV files containing the reference numbers and basic spatial coordinates for each property.

For organisations that need to reference a property consistently across systems, or want to link their own data to a national standard, this is a straightforward and free starting point.

**What you get:**

- The UPRN identifier
- Easting and northing coordinates (grid reference)
- No address text or property details

**What you don't get:**

- The property's postal address
- Building name or number
- Street, town, or postcode
- Information about whether the property is residential or commercial
- Whether the property is currently active or has been demolished

 

### The ONS UPRN Directory (ONSUD): Free but Limited

The [Office for National Statistics](https://www.ons.gov.uk/methodology/geography/geographicalproducts/nationalstatisticsaddressproducts) publishes the ONS UPRN Directory, commonly referred to as ONSUD. It's updated every 6 weeks and available as a free download. The directory links UPRNs to a range of statistical and administrative geographies, including census output areas, local authority districts, parliamentary constituencies, NHS regions, and rural-urban classifications.

If your work involves analysis at a geographic level, such as understanding how many properties fall within a given catchment area, or mapping UPRNs against health or electoral boundaries, ONSUD provides a useful bridge between individual property references and administrative context.

**What you get:**

- UPRN to geography lookups (local authority, parliamentary constituency, NHS region, and more)
- Rural-urban classification
- Built environment context (grid reference, country code)
- Free to download and use

 

**What you don't get:**

- Full postal address
- Property type (residential, commercial, mixed use)
- Occupancy status or date information
- Near real-time updates

 

For statistical purposes, the 6 week release cycle is usually adequate. For operational tasks, such as validating an address at the point of entry or ensuring a delivery record is current, this frequency can leave gaps.

ONSUD works well for research, policy analysis, and geography-linked reporting. It's less suited to anything that depends on knowing whether an address exists and is currently in use right now.

### OS AddressBase: The Full Picture (Licensed and Current)

OS AddressBase is Ordnance Survey's commercial address product. It comes in several editions, ranging from AddressBase Core through to AddressBase Premium, with the Premium edition offering the most complete data. Unlike the open or free datasets, AddressBase requires a licence, and the cost varies depending on how you intend to use it.

What you get in return is a significantly richer dataset. Every UPRN in AddressBase is linked to a full, structured postal address as well as a range of other attributes about the property. The data is compiled from multiple authoritative sources, including Royal Mail's Postcode Address File (PAF), local authority gazetteers, the Valuation Office Agency (VOA), and Ordnance Survey's own surveying activity.

**What you get:**

- Full structured postal address (building number, building name, street, locality, town, postcode)
- Logical status (approved, provisional, historical, alternative)
- Classification codes indicating property type (residential, commercial, educational, and many subcategories)
- Start date and last update date
- X, Y, and latitude/longitude coordinates
- Cross-references to the Postcode Address File and other datasets
- Regular updates

 

> AddressBase is scheduled to reach end of life in November 2027, with Ordnance Survey recommending migration to the OS NGD (National Geographic Database) Address Theme as its replacement. For organisations evaluating a direct integration today, that transition is worth factoring into any longer-term planning.

That said, accessing AddressBase directly isn't straightforward for most organisations. Licences are tiered by use case and volume, and the costs can be significant, particularly for commercial applications. Beyond the licensing, working with the raw data requires development resource to ingest, process, and keep it current. For many teams, building and maintaining that infrastructure isn't a realistic option alongside everything else they're working on.

That's where address API providers come in. Rather than dealing with the data directly, you get clean, reliable access to the same underlying information through a simple integration.

## Ideal Postcodes Solutions

Our address data is built on three authoritative sources:

Royal Mail's Postcode Address File (PAF), the definitive record of UK postal addresses,

OS AddressBase, the most detailed address dataset in Great Britain,

OSNI Pointer, the official address dataset for Northern Ireland. Together, they give us comprehensive and current UPRN coverage across the UK.

When someone looks up an address through our API or [address finder](https://ideal-postcodes.co.uk/address-finder), the result draws from these sources, which means it reflects the most complete and up-to-date version of that address available. We also return UPRNs as part of every address lookup, so the addresses you capture can be tied back to the national standard. This is vital for organisations linking records across systems, or anyone who needs a consistent property reference that will hold up over time.

View all our [UK datasets.](https://ideal-postcodes.co.uk/uk-address-datasets)

 

[Blog](https://blog.ideal-postcodes.co.uk/tag/blog), [UPRN](https://blog.ideal-postcodes.co.uk/tag/uprn)

## Read On

### [5 UPRN Myths You Must Stop Believing > Demystifying 5 common myths about UPRNs in Real Estate](https://blog.ideal-postcodes.co.uk/5-uprn-myths-you-must-stop-believing)

### [3 Highlights from Our Webinar on UPRNs in Real Estate > Missed the property address data event? Here’s what you need to know. ](https://blog.ideal-postcodes.co.uk/highlights-webinar-uprns-real-estate)

### [Customer Story: North Tyneside Council > How North Tyneside Council optimised their address database with UPRN](https://blog.ideal-postcodes.co.uk/blog/north-tyneside-council)

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