| ABS | American Bureau of Shipping |
| BRS | Bulgarian Register of Shipping |
| BV | Bureau Veritas |
| CCS | China Classification Society |
| CR | Croatian Register of Shipping |
| DNV | DNV |
| IRS | Indian Register of Shipping |
| INSB | International Naval Surveys Bureau |
| KRS | Korean Register of Shipping |
| LR | Lloyds Register of Shipping |
| NKK | Nippon Kaiji Kyokai |
| PRS | Polish Register of Shipping |
| RINa | Registro Italiano Navale |
| RS | Russian Maritime Register of Shipping |
| TL | Turkish Lloyd |
