| KNVB beker 1988/1989 - Appearances as Referee |  |
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 |
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| 02/10/1988 | DHC Delft | - | Vitesse | 1:4 | 1 | - | - |
| 25/05/1989 | PSV Eindhoven | - | FC Groningen | 4:1 | - | - | - |
| KNVB beker 1988/1989 - Appearances as Referee | |
|
|
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| 02/10/1988 | DHC Delft | - | Vitesse | 1:4 | 1 | - | - |
| 25/05/1989 | PSV Eindhoven | - | FC Groningen | 4:1 | - | - | - |
| Complete name: | John Blankenstein |
| Born: | 12/02/1949 † 25/08/2006 |
| Place of birth: |
Den Haag, 
Netherlands |
| Nationality: |
Netherlands |