The Norwegian Property Numbering System

Before we can use the Eiendom sources in Digitalarkivet confidently, we need to understand how Norwegian property is identified. To do this, it’s important to have some knowledge of the Norwegian property numbering system.

A practical primer before we search Eiendom in Digitalarkivet

Farm names alone are not enough. Names repeat across the country, spelling changes over time, and boundaries shift with subdivisions and municipal reforms. What stays legally precise is the property’s identifier in the official registers. In Norway, that means the numbering systems tied to the Matrikkel (the official property register) and the Grunnbok (the register of tinglyste rights and encumbrances). (Kartverket, 2026; Kartverket, 2025)

Over time, Norway moved from older matrikkel-based identifiers toward the modern gårds- og bruksnummer structure. If we trace a property across generations, we will almost certainly cross from one system into another. Without that foundation, property research becomes confusing. With it, Eiendom searches become structured and predictable. (Digitalarkivet, n.d.-a)

This is meant as a primer for the article “The Eiendom Sources in Digitalarkivet: A Complete Guide for Genealogists,” which I will publish shortly. I am also touching on this topic in my article, “Norwegian farm structure.”

Two systems behind the numbers: Matrikkelen and Grunnboken

It helps to keep two concepts separate:

• Matrikkelen is the official register of Norwegian properties and contains public information on boundaries, buildings, and addresses. (Kartverket, 2026)

• Grunnboken is the public register that shows tinglyste rights and obligations connected to a property (ownership transfers, mortgages, easements, and more). Historically, it was literally a “book” with a sheet for each property; today it is managed as a digital register. (Kartverket, 2025)

For genealogists, the takeaway is simple: the property’s identifier is the key that links the physical property (Matrikkel) to the legal paper trail (Grunnbok and the underlying tinglysing documents). That’s when the Norwegian property numbering system starts to make sense. (Kartverket, 2025; Kartverket, 2026)

The modern “working language”: Gårdsnummer and bruksnummer (gnr/bnr)

What is a gårdsnummer (gnr)?

A gårdsnummer identifies the main farm unit within a municipality. It is unique within that municipality. (Kartverket, 2021)

What is a bruksnummer (bnr)?

A bruksnummer identifies subdivisions (separate registered units) under that farm number—created over time through subdivision, sale, inheritance divisions, and later surveying/registration events. (Kartverket, 2021)

Example (illustrative):

• Gnr 45 = one main farm unit in that municipality

• Gnr 45, Bnr 3 = the third registered unit under that farm number

This gnr/bnr structure is what most modern property tools and Eiendom workflows are built around. (Digitalarkivet, n.d.-b)

A traditional way to think about it:

• The farm name is the everyday, historical name.

• Gnr/bnr is the property’s legal identity in the registers.

Farm names can repeat. Gnr/bnr is designed to be unambiguous within the municipality. (Kartverket, 2026)

Older identifiers you’ll meet in historical sources

Matrikkelnummer

A matrikkelnummer is an older property identifier used in earlier land register systems and commonly encountered in 1800s-era property contexts. It identifies a farm within a municipality under older numbering traditions, but it does not follow the modern gnr/bnr format. (Kartverket, 2021)

Løpenummer

In many 19th-century contexts, you’ll see a paired logic where a farm-level number is combined with a running number (løpenummer) for the individual holding/bruk. This is one reason older sources can look “numeric” without matching modern gnr/bnr patterns. (Kartverket, 2021)

The bridge moment: the 1886 Matrikkel

For property researchers, the late 1800s matter because standardized matrikkel work makes it easier to connect older identifiers to the later numbering logic we use today. In practice, the 1886 matrikkel (and local derivative lists) is often where we build the “bridge” between older references and modern gnr/bnr. (Digitalarkivet, n.d.-a)

Why the number changes in the sources (and the property didn’t “disappear”)

When a property seems to vanish, it is usually not gone—it has been renumbered or reorganized through normal administrative change, such as:

• Subdivision (new bruksnummer created over time) (Kartverket, 2021)

• Register transitions (older systems → “gammel grunnbok” → modern digital Grundbok) (Digitalarkivet, n.d.-b)

• Municipal reforms that affect how we must search in modern tools (Digitalarkivet, 2020)

This is exactly why we want to pin down the correct modern identifier before we rely on Eiendom searches.

Which number should we use for Eiendom in Digitalarkivet?

Use gårds- og bruksnummer (gnr/bnr) when searching Eiendom in Digitalarkivet, especially for workflows that involve Gammel grunnbok.

Digitalarkivet’s self-service solution for gammel grunnbok is designed for lookups by identifiers like gårdsnr, bruksnr, festenr, seksjonsnr (and related fields), and it generates a PDF of the relevant grunnboksblad. (Digitalarkivet, n.d.-c)

Also important: Digitalarkivet’s property services use the municipal structure as of 1 January 2020, and older kommune-/gårdsnummer can give zero (or wrong) hits if we don’t translate them to the modern framework. (Digitalarkivet, 2020)

How to find the gårds- og bruksnummer (gnr/bnr)

This is the practical heart of the preparation. We want the correct identifier before we start pulling grunnboksblad and chasing references into pantebøker. The sources for the Norwegian property numbering system linked here are in Norwegian, but you can easily use them by employing the translate feature in your web-browser.

1) Use Kartverket’s Eiendomsregisteret (address → gnr/bnr)

If we know a modern address, Kartverket’s Eiendomsregisteret is often the fastest way to discover gnr/bnr because it exposes public information from the official registers (Matrikkel and Grunnbok). (Kartverket, n.d.)

This is ideal when:

• we have an address from family papers, photos, later records, or a known location

• we want to anchor a historic farm to a modern identifier first

2) Use Norgeskart (map-first confirmation)

Kartverket’s Norgeskart is a practical “find it on the map” tool. It is widely used for locating places and viewing related datasets, and it is often a good way to confirm that we’re looking at the right place when names repeat. (Kartverket, n.d.-b; Norgeskart, n.d.)

This is ideal when:

• the address is uncertain, but the area is known

• multiple farms share similar names and geography is our best safeguard

3) For farms and agricultural property: use NIBIO Gårdskart

If we’re researching a traditional farm property, NIBIO’s Gårdskart is extremely useful. It is designed for agricultural properties and explicitly draws gnr/bnr from land-related registers while tying it to map context. (NIBIO, n.d.)

This is ideal when:

• the target is a landbrukseiendom or farm-based property

• we want both identifiers and land-use context in one place

4) Read gnr/bnr directly from a grunnbok context (if we already have paperwork)

If we already have a grunnboksutskrift, mortgage document, or a later property extract, the property identification is typically stated clearly, and we can use that identifier to drive the Digitalarkivet workflow. (Kartverket, 2025)

5) Use Digitalarkivet’s Gammel grunnbok self-service (once you have gnr/bnr)

Once gnr/bnr is known, Digitalarkivet’s Selvbetjening gammel grunnbok lets us order/download the grunnboksblad as a PDF—often the quickest way to get structured references to older tinglysing. (Digitalarkivet, n.d.-c; Digitalarkivet, n.d.-b)

6) If we only have older identifiers (matrikkelnummer/løpenummer): bridge forward, then confirm

When we start with 1800s sources, we often have older numbering and variable names. In that case, the safe method is triangulation:

• identify the farm by name + context (parish, neighbors, users)

• bridge forward using standardized matrikkel material and local reference lists

• confirm by matching geography and register headings before we proceed

A good rule of thumb: don’t move into Eiendom searching until we can connect the old reference to modern gnr/bnr with at least two independent confirmations (for example: map match + register heading match). (Kartverket, 2021; Kartverket, 2026)

This intro to the Norwegian property numbering system should make it easier to move into the Eiendom searches in Digitalarkivet. This will be covered in my next blog post.

If you have questions or comments, please comment below or send me a word through my contact page.

References

Digitalarkivet. (2020, April 22). «Gammel grunnbok» skifter til dagens fylkes- og kommunestruktur.

Digitalarkivet. (n.d.-a). Slik finner du tinglysinger i Digitalarkivet.

Digitalarkivet. (n.d.-b). Selvbetjeningsløsning for gammel grunnbok.

Digitalarkivet. (n.d.-c). Selvbetjening gammel grunnbok (bestill grunnboksblad).

Kartverket. (2021). Forklaring til matrikkelbrev og utdrag av matrikkelen (PDF).

Kartverket. (2025, November 19). Hva er grunnboken?

Kartverket. (2026, February 6). Dette er matrikkelen.

Kartverket. (n.d.). Eiendomsregisteret (innsyn i matrikkelen og grunnboka).

Kartverket. (n.d.-b). Norgeskart.no (Kartverkets karttjeneste).

NIBIO. (n.d.). Gardskart (tjeneste for landbrukseiendommer).

Norgeskart. (n.d.). Norgeskart.no (karttjeneste).