Bruksnummer
Bruksnummer (abbreviated bnr.) is part of the property designation, called the matrikkelnummer, that identifies a real property in Norway. Together with the kommune number, the gårdsnummer (gnr.) and, where relevant, the festenummer (fnr.) and/or seksjonsnummer (snr.), it gives every property in the matrikkel a unique address.
An example of a full matrikkelnummer is 0301-209/369/0/0: 0301 is the kommune number for Oslo, 209 is the gårdsnummer, 369 is the bruksnummer, and the two final zero fields show that the property is neither leased nor divided into sections. In practice, the numbers are usually shown as 0301/209/369/0/0 in Placepoint and as "Gnr 209 Bnr 369" in Grunnboken and in sales prospectuses.
The matrikkel is managed by Kartverket and is based on matrikkellova of 2005, which replaced delingsloven of 1978. A new bruksnummer is assigned by the kommune when a matrikkelenhet is created, typically after an oppmålingsforretning (a cadastral survey) in connection with a subdivision. The numbers are assigned consecutively within each gnr. and are not reused when properties are merged or cease to exist. The older bymatrikkel (town cadastre) in Oslo, Bergen and Trondheim used separate number series until the systems were harmonised in the 1980s, and traces of this still appear in historical documents.
Festenummer is used for plots held on a ground lease under tomtefesteloven, and seksjonsnummer for eierseksjoner, condominium units, under eierseksjonsloven.
In Placepoint you can search directly for a matrikkelnummer in the search field, or click a property on the map to open the property panel, where the gnr./bnr. and the rest of the matrikkel details are shown together.
How it looks in Placepoint
In Placepoint you find this in Search:

From Placepoint's glossary: Bruksnummer
More information: Kartverket: Matrikkelen, Lovdata: Matrikkellova, Store norske leksikon: bruksnummer
English: Cadastral unit number (bruksnummer, the second component of a Norwegian matrikkel address).
Frequently asked questions
What is a bruksnummer?
Bruksnummer is part of the property designation (the matrikkelnummer) for real property in Norway. Combined with the gårdsnummer (gnr.) and the kommune number, the bruksnummer (bnr.) identifies a property uniquely in the matrikkel.
How do I find the bruksnummer for a property?
You find the bruksnummer in Grunnboken, at Kartverket, in property listings, or by searching for an address in Placepoint or Seeiendom. The matrikkelnummer is stated as gnr./bnr.
What is a matrikkelnummer?
The matrikkelnummer consists of the kommune number, the gårdsnummer and the bruksnummer, plus a festenummer and/or seksjonsnummer where the property is a section or a festetomt (leased plot). Example: 0301-1/2 (Oslo, gnr. 1, bnr. 2).
Can I choose the bruksnummer myself?
No, a bruksnummer cannot be chosen freely. It is assigned by the kommune when a new property is created through subdivision, and it follows a running number series within each gårdsnummer.
What is a festenummer?
A festenummer is part of the matrikkelnummer for a festetomt. Where a landowner leases out a plot to a fester (the leaseholder), the lease contract gets its own festenummer in addition to the gnr./bnr.