{
  "category": "company-id",
  "updated": "2026-10-08",
  "confidence_levels": {
    "verified": "Read on the official page/file.",
    "verified-archive": "Official page, read via a Wayback Machine snapshot (live site blocks automated fetches); 'archive' has the snapshot URL.",
    "secondary": "Secondary source only (e.g. Wikipedia); treat as unconfirmed.",
    "uncertain": "Plausible but not confirmed; do not rely on it."
  },
  "title": "Test company registration numbers",
  "items": [
    {
      "country": "NO",
      "value": "Organisasjonsnummer starting with 2 or 3",
      "purpose": "Brønnøysundregistrene keeps synthetic test organisations (found via Tenor) whose numbers start with 2 or 3; real ones start with 8 or 9.",
      "source": "https://utviklerportal.nhn.no/informasjonstjenester/virksomhetstjenester/organisasjonsregisteret/organization-registry/docs/genereltmd",
      "confidence": "secondary",
      "note": "Documented by Norsk helsenett, not by Brønnøysund itself."
    },
    {
      "country": "GB",
      "value": null,
      "purpose": "No reserved company-number range; create test companies on demand in the Companies House sandbox (Test Data Generator API, https://api-sandbox.company-information.service.gov.uk).",
      "source": "https://developer.company-information.service.gov.uk/api-testing",
      "confidence": "verified"
    },
    {
      "country": "FI",
      "value": "Any fictitious Y-tunnus with a valid check digit (e.g. 8351634-3)",
      "purpose": "Vero's test-data guidance; no reserved range, so a generated number may exist.",
      "source": "https://vero.fi/positiivinenluottotietorekisteri/ohjelmistokehittajille/sidosryhmatestaus/339014/ohje-testiaineiston-anonymisoinnista/",
      "confidence": "verified"
    },
    {
      "country": "DK",
      "value": null,
      "purpose": "FOTM test companies reportedly have valid CVR numbers not in the register (unconfirmed).",
      "source": null,
      "confidence": "secondary"
    },
    {
      "country": "SE",
      "value": null,
      "purpose": "No official test organisationsnummer found (Skatteverket/Bolagsverket).",
      "source": null,
      "confidence": "uncertain"
    }
  ]
}