Norway postnummer validator
How the postnummer format works
- Format
- 4 digits
- Example
- 0001
Things to watch for
- Format-only check — does not confirm the postnummer actually exists
- Always exactly 4 digits with no separators
^[0-9]{4}$A Norwegian postnummer is the 4-digit postcode Posten Norge uses to route mail, written with no separator — for example 0001, reserved for a specific delivery point in Oslo. The numbering runs roughly south to north: Oslo and the populous southeast anchor the low end, and codes climb steadily up the coast and inland as they move toward the sparsely populated far north. Anyone validating a Norwegian shipping address or a checkout form needs the postnummer to at least be the right length and shape before it’s trusted.
Because the postnummer is a plain 4-digit run with nothing to anchor against, a dropped or duplicated digit is easy to miss visually while still looking entirely plausible. Catching that at the point of entry is cheaper than a parcel misrouted the length of the country.
How this validator works
This tool checks that the input is exactly 4 digits with no letters, spaces, or hyphens, entirely in your browser, with nothing sent to a server.
What a pass doesn’t tell you
A postnummer carries no check digit, so a correctly shaped 4-digit string is the most a client-side tool can confirm — not that Posten Norge has assigned it to a real town or street. Confirming that requires Posten Norge’s own postcode lookup.
Scope: this page and tool cover format validation only — not address lookup, region matching, or confirming a postnummer is currently in use.
postnummer FAQ
Does the number in a Norwegian postnummer mean anything about location?
Yes, broadly. Posten Norge assigned postnummer ranges to run roughly south to north: Oslo and the populous southeast sit at the low end, and the numbers climb steadily up the coast and inland through the country, with the far-north county of Finnmark landing at the high end.
Are some postnummer ranges reserved for things other than street addresses?
Yes — Posten Norge sets aside blocks of low-numbered codes for post office boxes and organisations in and around Oslo, separate from the ranges used for ordinary street delivery. A postnummer alone doesn't tell you which kind of address it is; that requires Posten Norge's own lookup.
Does a correctly formatted postnummer mean it actually exists?
No. This tool only confirms the string is exactly 4 digits — it doesn't check it against Posten Norge's actual assignment list. Confirming a postnummer is real, and seeing which town it covers, requires Posten Norge's own postcode lookup.