Some important E-Government applications that you may inquire your registered details including your Turkish ID number, tax number and social security registration. (By using below links, you will be directed to the governmental web pages)
TURKISH NATIONAL IDENTITY NUMBER
You may learn your Turkish National Identity Number by using above link.
TURKISH SOCIAL SECURITY SYSTEM
Application Site: https://esgm.sgk.gov.tr/Esgm/UyrukSec?uyrk=0
You may learn your Turkish Social Security details by using above link.
1.ENTRY TO THE E-SGK SYSTEM
2.CHECK IF YOU ARE REGISTERED TO TURKISH SOCIAL SECURITY SYSTEM
3.SOCIAL SECURITY PREMIUMS OF DEPENDENTLY (4A) AND INDEPENDENTLY (4B) WORKING FOREIGNERS
4.CHECK IF YOU ARE REGISTERED WITH GENERAL HEALTH INSURANCE SYSTEM
TURKISH TAX NUMBER
Application Site: https://intvd.gib.gov.tr/internetvd/index.jsp?page=IVD_VKNO
You may learn your Turkish tax number by using above link.