Support Profound information is a matter of course at hopf. Get your support here and clear up your concerns with one of our experts. Your concern - our support Salutation: Mr. Mrs. First name: Last name: * Firm: Telephone: E-mail: * Serial number (S/N): * Commissioning number (KN): You can find the hopf commissioning number on the following documents: order confirmation / packing list / dispatch of delivery / invoice. The commissioning number on these documents is marked with 'KN'. Message: Your message to hopf ...