OSNI® Pointer® is the authoritative address database for addressable buildings in Northern Ireland with almost 1 million points.  It is maintained by Land & Property Services (LPS), with input from local councils and Royal Mail.

Each building is assigned a postal address with a geographic position (EPSG: 29900 TM65 Irish National Grid coordinates). All buildings which are Primary Addressable Objects (PAO) have a unique building identifier and each addressable unit within a building which is a Secondary Addressable Unit (SAO) has a unique property reference number (UPRN).  Buildings with several addresses have multiple UPRNs related to the unique building identifier.  In some instances, buildings can have more than one PAO and in such cases each PAO will have a separate UPRN.

As well as address information, OSNI® Pointer® contains building and address status and building classification. Each record can be linked to other OSNI datasets such as OSNI® Fusion® (large scale vector mapping) via land parcel and building identifiers, boundary information and LPS Property Data (via UPRN) and Transport Network (via unique street reference number - USRN).

Ordnance Survey of Northern Ireland (OSNI) is the official producer of geographic mapping for Northern Ireland. OSNI is part of Land & Property Services (LPS), a government agency within the Department of Finance and collects, processes and manages land and property information in support of economic and social development in Northern Ireland.