If you are living in Belgium, you do have a Belgian national number, even if you do not know it (for instance, because you have a special identity card issued by the European Commission).
What does the Belgian ID number look like?
It starts with the 6 digits of your date of birth and contains 5 additional digits, for example, if you were born on 31st of December 1980 your Belgian ID number could look like: 80.12.31 123-45
Where can you obtain your Belgian ID number?
You have various options to choose from:
(a) If you have a Belgian ID card, it is written on the back side of it;
(b) If you happen to receive your “Déclaration à l’impôt des personnes physiques” (EN: “Income Tax Declaration”), it normally contains your Belgian ID number,
(c) If you had signed any legal document in Belgium, bought a house, etc… it should be stated there too,
(d) You may visit your City Hall administration and request it,
(e) If you have identification stickers (“vignettes”) from your mutuality, it is written there,
(f) If you are working for the European Commission, you can send an email to HR-CARTE-IDENTITE@ec.europa.eu or to firstname.lastname@example.org giving your date of birth and they will contact the ministry to get the number for you. This can take anything between a couple of hours to 1 or 2 days – depending on how fast the ministry acts,
(g) If you work in another EU/International institution, your Human Resources department should be able to provide you with assistance. If this is the case, we would appreciate it if you let us know the email address.