The Bitmap OCI by Boppleton is an inscription module that can resolve any blockheight to its Bitmap District. This is inscribed as part of 609.bitmap family tree. This is the latest updated version.

0-907k : unvalidated, not a source of truth! there are still discrepancies in this data! always DYOR
Bitmap on-chain index (OCI) module with post-840k addition (0-906,999.bitmap)