testland/synthetic-pii-generator
Use when seeding non-production environments, building demo data, or replacing real personal data in copied datasets. Generates fake but valid-looking PII: names, emails, phones, addresses, national IDs and SSNs, Luhn-valid test card numbers and birth dates, never real people's data.
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pii-lookup-tables.mdreferences/
PII safe-value lookup tables
Reserved test ranges and issuer-published test values that pass real format validators without matching a real person. Emit these constants instead of trusting a generator's defaults, which may collide with a real number.
Phone numbers - region-specific test ranges
| Region | Test range |
|---|---|
| US | (555) 0100 - (555) 0199 (per Numbering Plan documentation, reserved for fictional use). |
| UK | 0790 7900 000-999 (Ofcom reserved for drama/fiction). |
| Germany | +49 (123) 4567-... patterns reserved for examples. |
Faker's phone_number defaults to format-valid but doesn't guarantee
non-real numbers. For absolute safety, post-process generated phone
numbers to substitute the regional test range.
Government IDs - never generate real-format
| ID | Synthetic strategy |
|---|---|
| US SSN | Use the IRS test range 900-XX-XXXX to 999-XX-XXXX (not validly issued). Faker's ssn() defaults to invalid-format strings. |
| US ITIN | Format: 9XX-7X-XXXX or 9XX-8X-XXXX (range reserved for ITIN issuance; never generate real values). |
| UK NI Number | AB123456C patterns; use JR987654A style which HMRC reserves. |
| Generic | If your test environment doesn't enforce format validation, use obvious-fake values like 000-00-0000. |
Never generate values from a real-issuance range. A correctly- formatted but real-issuance SSN may collide with a real person - the exact privacy violation this skill avoids.
Credit card numbers - test BIN ranges
Major card networks publish test BIN ranges that pass Luhn checksum but never authorize. Use these in test fixtures:
| Card type | Test BIN (use with random suffix; Luhn-valid) |
|---|---|
| Visa | 4111 1111 1111 1111 |
| Mastercard | 5555 5555 5555 4444 |
| American Express | 3782 822463 10005 |
| Discover | 6011 1111 1111 1117 |
(Standard Stripe / Adyen test cards; documented in their respective
testing guides.) Faker's credit_card_number() produces format-valid
values but may collide with a real card if the issuer's BIN happens to
match; the Stripe / Adyen test cards are guaranteed safe.