Do you have questions about VIER? Contact us!


How to reach us

Address & Contact


Hamburger Allee 23
30161 Hannover

Phone: +49 511 95 73 95 1000

Further locations

Office Aachen: Theaterstraße 90, 52062 Aachen, Germany
Office Berlin: Schlesische Str. 27, 10997 Berlin, Germany
Office Hamm: Münsterstr. 5, Haus 4, 59065 Hamm, Germany
Office Karlsruhe: Ludwig-Erhard-Allee 34, 76131 Karlsruhe, Germany
VIER Cognesys: Theaterstraße 90, 52062 Aachen, Germany
VIER Schweiz AG: Hirschengraben 33, 6003 Luzern, Switzerland

Questions about our products?

You are not yet a customer and have questions about VIER? Contact our experts! They will be happy to answer your questions about our products and help you find the right product for your case.

Phone: +49 511 95 73 95 1111

Become a reseller

If you are interested in a resale partnership, please feel free to contact us.

Phone: +49 511 95 73 95 1444

Customer support

You are a customer of ours and need support? At our Customer Service Desk you can get information and help for your products!

Phone: +49 511 95 73 95 4444

For fast processing of your requests, we have set up an online customer support via ticket system. Here you can quickly and easily describe your concern or problem and track the processing.

How can we help you today?

Do you have questions about VIER or would you like personal advice? Contact us now via our contact form. You can reach us at any time via the contact form, by e-mail to or by telephone on +49 511 95 73 95 1111. We look forward to hearing from you and will get back to you as soon as possible!  

Please reload this page in your internet browser if the form is not displayed.  

VIER whistleblowing system  

Do you have something unpleasant to tell us? With the VIER whistleblower system, our partners and clients also have the opportunity to anonymously inform us of grievances and violations. All tips will be checked and, if necessary, followed up!  

To the whistleblower system: