ID numbers
| Pri |
Title |
Example |
Idno |
Conversion & notes |
| 3a |
British O.N. |
1234 |
1001234 |
prefix 1 |
| 3b |
British O.N. |
12345 |
1012345 |
prefix 1 |
| 3c |
British O.N. |
123456 |
1123456 |
prefix 1 |
| 3d |
American O.N. |
1234 |
2001234 |
prefix 2 |
| 3e |
American O.N. |
12345 |
2012345 |
prefix 2 |
| 3f |
American O.N. |
123456 |
2123456 |
prefix 2 |
| 3h |
Swedish O.N. |
1234 |
3001234 |
prefix 3 |
| 3i |
Swedish O.N. |
12345 |
3012345 |
prefix 3 |
| 3j |
Japanese O.N. |
1234 |
4001234 |
prefix 4 |
| 3k |
Japanese O.N. |
12345 |
4012345 |
prefix 4 |
| 2 |
LR No, 6 digit |
512345 |
5512345 |
prefix 5 |
| 1a |
LR/IMO No, 7 digit |
5123459 |
5123459 |
no change |
| 4 |
Merchant ships |
no number |
5600000> |
constructed number |
| 5 |
Naval ships |
no number |
6100000> |
constructed number |
| 3g |
Swedish O.N. |
123 |
3000123 |
prefix 3 |
| 6 |
Temporary numbers |
- |
5700000> |
constructed number |
| 7 |
Temporary numbers |
- |
<56000 |
electronically allocated |
| 1b |
LR/IMO 1000000> |
1001011 |
5651011 |
first 3 digits changed |
- Copyright R.B.Haworth, Wellington, New Zealand, 2006.
- Whilst all care is taken to ensure accuracy of the information in this website, no responsibility can be taken for errors or the consequences thereof.