Release Notes

Release notes for the OS Open UPRN product over the last year.

Please note

• Any interruptions or data issues impacting the OS Open UPRN product will be documented on the Known Data Issues and Service Disruptions page.

• OS Open URPN is refreshed on a six-weekly basis, in-line with the AddressBase Epoch dates published on the 'Product Refresh Dates' dates page. (The AddressBase release notes include information on the AddressBase, AddressBase Plus, AddressBase Premium and OS Open UPRN products, including the Full Supply record count for OS Open UPRN.)

• Areas of Interest (AOI) orders and Change-Only Updates (COUs) are not available for OS Open UPRN.

OS Open UPRN – January 2026 release note

This release note provides information about the January 2026 (Epoch 124) release of OS Open UPRN.

OS Open UPRN – November 2025 release note

This release note provides information about the November 2025 (Epoch 123) release of OS Open UPRN.

OS Open UPRN – October 2025 release note

This release note provides information about the October 2025 (Epoch 122) release of OS Open UPRN.

OS Open UPRN – September 2025 release note

This release note provides information about the September 2025 (Epoch 121) release of OS Open UPRN.

OS Open UPRN – July 2025 release note

This release note provides information about the July 2025 (Epoch 120) release of OS Open UPRN.

OS Open UPRN – June 2025 release note

This release note provides information about the June 2025 (Epoch 119) release of OS Open UPRN.

OS Open UPRN – May 2025 release note

This release note provides information about the May 2025 (Epoch 118) release of OS Open UPRN.

OS Open UPRN – March 2025 release note

This release note provides information about the March 2025 (Epoch 117) release of OS Open UPRN.

OS Open UPRN – February 2025 release note

This release note provides information about the February 2025 (Epoch 116) release of OS Open UPRN.