The register can be searched on this link https://apps.communities-ni.gov.uk/harni/
Alternatively the Historic Environment Map Viewer has a Heritage at Risk layer which shows the locations of all the heritage at risk buildings across Northern Ireland. Link to Historic Environment Map Viewer – https://dfcgis.maps.arcgis.com/apps/webappviewer/index.html?id=6887ca0873b446e39d2f82c80c8a9337