| Carrier Code | Carrier Name |
| MBNC | MARITIME BROKERS & CONSULTANTS INC |
| MBOL | MILLER BOAT LINE INC |
| MBOU | MOBILBOX GMBH |
| MBYC | MOBILITY CO SA |
| MCAU | MARCONI COMMUNICATIONS INC |
| MCBG | MID-COAST BARGE LINES INC |
| MCEU | MASSACHUSETTS CENTRAL RAILROAD CORPORATION |
| MCHA | MARINE CHARTERING |
| MCIS | MORAN CONTAINER SERVICES COMPANY |
| MCMU | MANAGEMENT CONTROL & MAINTENANCE S A |
| MCON | MARLINS CONSOLIDATORS INC |
| MCPP | MARITIME COMPANY OF THE PACIFIC |
| MCPU | MCC TRANSPORT |
| MCRU | MARITIME CONTAINER INC |
| MCSC | MINI CARRIER SERVICES INC |
