| Belgacom | Bd. du Roi Albert II 27 1030 Brussels (0)2 202 41 11 |
| Brutele | Rue de Naples 29-31 1050 Brussels (0)2 511 65 43 |
| BT | Telecomlaan 9 1831 Diegem (0)2 700 22 11 |
| B-Telecom | Hallepoortlaan 40 1060 Brussels (0)2 525 97 22 |
| Colt | Zweefvliegtuigstraat 10 1130 Brussels (0)2 790 16 82 |
| Euphony Benelux | Ankerrui 9 2000 Antwerp (0)3 201 63 63 |
| Level 3 Communications | Avenue Léon Grosjean 2 1140 Brussels (0)2 400 50 00 |
| MCI | Culliganlaan 2E 1831 Diegem 02/400 83 00 |
| Scarlet | Medialaan 50 1800 Vilvoorde (0)2 275 33 11 |
| Tele2 Belgium | Chaussée de Wavre 1945 1160 Brussels (0)2 213 02 10 |
| Telenet | Liersesteenweg 4 2800 Mechelen (0)15 33 30 00 |
| TTG Belgium | Regentlaan 55 1000 Brussels (0)2 550 60 00 |
| UPC Belgium | Chazallaan 140 1030 Brussels (0)2 240 08 00 |
| Versatel | Koningin Astridlaan 166 1780 Wemmel (0)2 610 30 00 |