| Carrier Code | Carrier Name |
| NPMI | NORTH PACIFIC MARITIME INC |
| NPSL | NORTH PACIFIC STEAMSHIP CORP. |
| NPSU | NIGEL PARKES LTD |
| NPTU | NEPTUNE LEASING INC |
| NQMC | NIKI MARINE COMPANY INC |
| NQSC | NARCISSUS SHIPPING CORPORATION |
| NQSH | NETWORK SHIPPING LTD (A LIBERIAN COMPANY) |
| NRDC | NORDIC MARINE CORP INC |
| NRDS | NORDSTROM & THULIN AB |
| NRIU | NATIONAL REFRIGERANTS INC |
| NRSU | NIPPON RIKU-UN SANGYO CO LTD |
| NRVL | NARVAL SHIPPING CORP |
| NSAU | NATIONAL SHIPPING COMPANY OF SAUDI ARABIA |
| NSBU | NATIONAL CENTER FOR ATMOSPHERIC RESEARCH-NATIONAL SCIENTIFIC BALOON |
| NSCS | NATIONAL SHIPPING COMPANY OF SAUDI ARABIA |
