A UDPRN (Unique Delivery Point Reference Number) is an 8-digit code that uniquely identifies every delivery point within Royal Mail's PAF. It stays attached to that delivery point, giving you a reliable key for storing and matching addresses.
UDPRN vs UPRN
A UDPRN is Royal Mail's PAF delivery-point reference; a UPRN is Ordnance Survey's property identifier. Many systems use both. Read what a delivery point is for the underlying concept.
Where you'll meet UDPRNs
UDPRNs appear in PAF-backed lookups and verification responses. Access them via PAF data access and return to the PAF guide hub.
Frequently asked questions
What is a UDPRN?
A UDPRN (Unique Delivery Point Reference Number) is an 8-digit identifier Royal Mail assigns to every delivery point in the Postcode Address File, used to reference an address record consistently.
What is a UDPRN used for?
UDPRNs let systems store and match a PAF address by a stable number rather than fragile address text, improving data quality and deduplication.
Is a UDPRN the same as a UPRN?
No. A UDPRN is Royal Mail's delivery-point reference within PAF; a UPRN is Ordnance Survey's property identifier. They serve related but different purposes.
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