What is the IDUFIR number, and what differentiates it from the CRU and the Cadastral Reference?

The IDUFIR emerged as an alternative to the cadastral reference, providing more security and guarantees in the unique identification of properties registered in the Land Registry.

Although we can still find the cadastral reference in some documents, for example in purchase deeds prior to the IDUFIR, this quickly became the one used both by notaries and by individuals when requesting, for example, a Simple Informative Note in the Registry.

Later, in 2016, the CRU appeared, an evolution of the IDUFIR that maintained the same characteristics: 14 digits without variation over time, totally different from the cadastral reference.

Currently, given that the CRU has only been in use for a few years, the IDUFIR continues to appear as an identifier in documents such as the IBI, Simple Notes and Registry Certifications.