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