Masked categories

The 26 personal data categories. Special categories under KVKK Article 6 are marked separately.

Siper detects and masks 26 personal data categories in Turkish text. This page is the full list: next to each category you will find a short description and a synthetic example. Nine categories fall under the special categories of personal data defined in Article 6 of KVKK (Turkey’s personal data protection law); you will find them in a separate section.

All examples are synthetic and do not belong to any real person. In masked output, each category has its own placeholder; the API returns them with English names. For format details, see Concepts.

General categories

Category	Description	Synthetic example
Person	First and last name.	`Ahmet Yılmaz`
Address	Street, neighborhood, and full address details.	`Zambak Sk. No:4`
Birth date	Date of birth with day, month, and year.	`12.03.1981`
TCKN	TCKN (Turkish national ID number).	`10000000214`
YKN	Foreign national ID number; starts with 99.	`99…`
VKN	Tax ID number.	tax ID
MERSİS	Companies’ Central Registry System (MERSİS) number.	MERSİS no
SGK	Social Security Institution (SGK) registry number.	SGK registry no
Passport	Passport number.	`U1234…`
Serial no	ID card serial number.	ID serial
Phone (mobile)	Mobile phone number.	`0532 000 11 22`
Phone (landline)	Landline number.	`0212…`
Email	Email address.	`[email protected]`
IBAN	Bank account number.	`TR33…`
Card	Payment card number.	`4111…`
License plate	Vehicle license plate.	`35 ABC 042`
IP address	IP address.	`10.1.2.3`

Special categories (KVKK Article 6)

The nine categories below fall under Article 6 of Law No. 6698. A category name on its own is not personal data; mentioning the concept of “union membership” and writing down a specific person’s union membership are different things. That is why every example in the table is a sentence, and the backticked part is the expression Siper masks in that sentence. All examples are synthetic and have been verified against the live service; no real belief, origin, party, or organization name appears.

Category	Description	Example sentence and masked part
Health	Diagnosis, treatment, and health status tied to a person.	Ayşe Demir’e `diyabet tanısı` kondu.
Religion	Statements about a person’s religious belief.	Çalışan, `dini inancı` gerekçesiyle izin talep etti.
Ethnic origin	Statements about a person’s ethnic origin.	Tanık, `etnik kökenine` yönelik ayrımcılığa uğradığını belirtti.
Political opinion	A person’s political opinion and party membership.	Başvuran, `Y Partisi üyeliğini` doğruladı.
Union membership	A person’s union membership.	Ahmet Yılmaz, `Örnek-İş Sendikası` üyesidir.
Criminal conviction	A person’s conviction and security measure information.	Müşteri, `adli sicil kaydı` bulunmadığını beyan etti.
Sex life	Statements about a person’s sex life.	Danışan, `cinsel yönelimini` görüşmede paylaştı.
Biometric	Biometric template and record codes; a code is masked only when it appears near a biometric context.	Parmak izi şablonu `FP-7788` sistemde kayıtlı.
Genetic	Gene and variant names tied to a person; a name is masked only within a genetic context.	`BRCA1` mutasyonu taşıdığı genetik testle doğrulandı.

Siper errs on the side of caution in these categories: an expression like “diyabet tanısı” (diabetes diagnosis) may be masked even when the sentence does not tie it to a specific person. This is a deliberate choice; the risk of missing personal data outweighs the cost of masking a general expression unnecessarily. To exclude patterns specific to your organization that you are certain carry no personal data, use the allow_patterns field (Mask-only usage → Pattern lists).

If you want to narrow the scope, the /mask request offers predefined category sets; for example, KVKK_SENSITIVE masks only these nine categories. Details: Mask-only usage → Category filtering. To try the categories on your own text, use the Playground.