The Embassy and Consulate General of Belgium issues visas that give the applicants access to a total of 25 countries in the Schengen Area. Visa for Belgium and Schengen visa [common to all Schengen States] are issued at the same time.
Do keep in mind that the application for the Schengen Visa will be accepted by Belgium Visa application Centre only if Belgium is the country of maximum stay.
If, in the event that the duration of stay is almost the same in more than one Schengen States, the first point of entry should be Belgium.