The first four letters of the booking number indicate which ferry operator the booking number belongs to. In the table below you can see exactly which SCAC code belongs to which operator.
| Operator | SCAC | Example | Additional explanation |
| CLdN | STRK | CLVW0012345678 | “CLVW” & “00” & booking number (8 digits) |
| DFDS | DFDS | DFDS12345678 | “DFDS” & booking number (8 digits) |
| P&O Ferries | PONF | PONFEU12345678 | “PONF” & “EU” & booking number (8 digits) |
| Stena Line | STNL | STNL0012345678 | “STNL” & “00” & booking number (8 digits) |
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