Japanese My Number Corporate

Detects Japanese My Number Corporate patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. The Corporate Number (法人番号) is a 13-digit identifier assigned to corporations and organisations in Japan by the National Tax Agency.

Type: regex
Engine: universal
Confidence: medium
Confidence justification: Medium confidence: thirteen-digit numbers are uncommon but can appear in other contexts. Keywords such as '法人番号' or 'corporate number' significantly improve detection accuracy. Added context gating and exclusion rules improve precision and reduce incidental matches.
Detection quality: Verified
Jurisdictions: jp
Regulations: APPI
Data categories: business-identifier
Scope: narrow
Risk rating: 4
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b\d{13}\b

Corroborative evidence keywords

法人番号, corporate number, my number, マイナンバー, 法人, corporate identification, corporate my number, houjin bangou, 会社法人等番号, 国税庁, 法人マイナンバー, 法人番号公表サイト, field, column, row, entry, record, value, form, register (+21 more)

Proximity: 300 characters

Should match

1234567890123 — Thirteen-digit corporate My Number
9876543210987 — Thirteen-digit corporate identifier
1122334455667 — Thirteen-digit corporate number format

Should not match

123456789012 — Twelve digits, too short for corporate My Number
12345678901234 — Fourteen digits, exceeds corporate My Number format
template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

Other thirteen-digit numeric identifiers from non-corporate contexts Mitigation: Require corroborative evidence keywords such as '法人番号' within the proximity window to confirm corporate context.
Concatenated numeric data in financial reports or data exports Mitigation: Use document classification to prioritise matches in corporate registration documents and official filings.

References

Japanese My Number Corporate entity definition - Microsoft Learn