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Public-images-osm logo.svg ref:bag:old
Osm element key.svg
BAG reference number for properties that are no longer in the BAG database Edit or translate this description.
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areasmay be used on relations
Status: unspecified

Just like the key ref:bag=* This key contains the reference number (ID) from the BAG database containing addresses and buildings in the Netherlands. ref:bag:old is used when the object does exist no longer according to the BAG database, but still exists on the ground.

One can look up the record in the database using (dutch). Note that this website requires 16 digit ID's for buildings, append a zero (or two) in front of the ID when necessary.