DOI registration agency DataCite has launched a new publicaly available tool Dashboard for visualizing records of objects that have been assigned DOI identifiers. The tool allows exploration of records, for example, by consortia, specific institutions, year of creation.
The dashboard also displays statistics on the completeness of individual metadata fields. You can explore for example the results within the Czech DataCite consortium within the National DOI Center: https://metadata.datacite.org/cevl
You can read more about the Dashboard tool in the blog post: https://doi.org/10.5438/p7h4-9s17 and the DataCite documentation: https://support.datacite.org/docs/datacite-metadata-dashboard