To enjoy the majority of consular services offered by the embassy (or its consulate) you need to be registered.
Or perhaps you are expecting or just welcomed a child?
Require a new passport? (Registration required)
Identity card (eID)
Require a new eID? (Registration required)
Engagement of financial sponsorship
Are you willing to financially support a family member or friend with visa related matters?
General information about consular services for Belgians abroad
See the public website of the FPS Foreign Affairs: http://diplomatie.belgium.be/en/services/services_abroad/