Here are major digital out‑of‑home (DOOH) companies and programmatic platforms that operate in Belgium (not exhaustive). I’ve included a short note on each and a source.

Operators / media owners

• JCDecaux Belgium — large national DOOH footprint (shopping‑centres, retail entrances, metros, airports) and programmatic DOOH offering (VIOOH, Displayce integrations). (jcdecaux-belux.com)
• Bauer Media Outdoor / Clear Channel Belgium — Clear Channel’s Belgium business (now part of Bauer Media Outdoor) runs a wide DOOH network (street furniture, stations, Adshel Live) and has launched programmatic tools (LaunchPAD/multi‑SSP integrations). (clearchannel.be)
• blowUP media (part of Ströer) — premium large‑format LED and city‑centre DOOH network in Antwerp, Brussels, Ghent, Knokke (Frontline). (blowup-media.be)
• DOOH‑tv / DOOH‑tv Belgium — digital signage network concentrated in shopping malls (100+ digital screens and kiosks in Belgian malls). (quividi.com)

Programmatic platforms / aggregators commonly used in Belgium

• VIOOH — global DOOH SSP/marketplace used for programmatic access to premium inventory (JCDecaux uses VIOOH for airport and other inventory). (blog.viooh.com)
• Displayce — European programmatic DOOH buying platform with a Brussels/Benelux presence; aggregates many media owners for programmatic buys. (displayce.com)
• Place Exchange — SSP integrated with Clear Channel LaunchPAD to open Clear Channel (now Bauer/LaunchPAD) inventory to programmatic buyers. (placeexchange.com)
• Glooh — DOOH campaign optimizer/aggregator that lists Belgium coverage (Brussels, Antwerp, Liège, etc.). (glooh.co)

Notes

• Several of the large global OOH owners (JCDecaux, Clear Channel/Bauer Media Outdoor, Ströer/blowUP) operate most of the premium street, transport and large LED inventory; programmatic access is commonly offered via VIOOH, Place Exchange, Displayce and other SSPs/aggregators. (jcdecaux-belux.com)
• This list focuses on media owners and programmatic DSP/SSP/aggregator platforms. There are also many local integrators, retailers’ retail‑media screens, and agency trading desks active in the Belgian DOOH market (not every local player is listed here).

If you’d like, I can:

• produce a downloadable spreadsheet with contact pages and inventory counts for each operator, or
• map DOOH coverage by city (Brussels/Antwerp/Ghent/Liège) and show programmatic access options for each owner.