What is the cadastral reference (referencia catastral)?
The cadastral reference is the unique 20-character code that identifies a property in Spain's Catastro — use it to pull the official surface, use and location, and to confirm a listing describes the home it claims to.
You can look up the reference on the Catastro's public portal to see the registered floor area and characteristics. It should match the nota simple and the listing.
A property whose cadastral details don't match what's advertised is a reason to ask questions before you commit.
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Related questions
Sources: Dirección General del Catastro — sede.catastro.gob.es.