Property talk:P2771

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D-U-N-S number
unique company identifier from Dun & Bradstreet

Data type	External identifier
Domain	According to this template: business (Q4830453) According to statements in the property: business (Q4830453), nonprofit organization (Q163740), educational organization (Q5341295) or government agency (Q327333) When possible, data should only be stored as statements
Allowed values	\d{9}
Example	Langley Holdings (Q15825279) → 548160290 ORCID, Inc. (Q19861084) → 968806054
Source	National search portals, e.g. UPIK (note: this information should be moved to a property statement; use property source website for the property (P1896))
Formatter URL	https://duns.report/DUNS/$1
See also	D&B Hoovers company profile (P5232)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P2771 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 326 Main statement 309 94.8% of uses Qualifier 2 0.6% of uses Reference 15 4.6% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Type “business (Q4830453), nonprofit organization (Q163740), educational organization (Q5341295), government agency (Q327333)”: item must contain property “instance of (P31)” with classes “business (Q4830453), nonprofit organization (Q163740), educational organization (Q5341295), government agency (Q327333)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2771#Type Q4830453, Q163740, Q5341295, Q327333, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2771#Unique value, SPARQL (every item), SPARQL (by value)

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2771#Single value, SPARQL

Format “\d{9}”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2771#Format, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2771#Entity types

Scope is as main value (Q54828448), as reference (Q54828450): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2771#Scope, SPARQL

Not just for businesses

Currently this is set to describe businesses and subclasses.

All sorts of organizations may need this number, such as universities or nonprofit organizations which do projects with governments using the DUNS system. Blue Rasberry (talk) 21:40, 11 July 2021 (UTC)