Central telephone directory assistance
for the university and college region in Darmstadt

HRZ provides central telephone directory assistance. This is the point of contact for the entire university and college region in Darmstadt.

Due to the current security review on Log4J, the online information service has been deactivated as a precaution. We are currently checking if and when a restart is possible. Until then, TU employees can use the IDM-Portal to find the phone numbers of other employees. Other users please contact the central telephone information service mentioned below.

Update 15.12.2021

User groups

The central telephone information desk can be contacted by all TU members, as well as guests and external persons.

Service characteristics

Central telephone directory assistance offers...

  • Telephone redirection
  • Information about locations (e.g. for suppliers and vendors, who are looking for specific buildings etc.)
  • Telephone services for non-domestic calls (only for employees)
  • Online address book in the IDM portal for finding phone numbers within the TU Darmstadt.
    Note: The online address book is only available for TU members (login with TU-ID).

You can reach us via

internal: 99
external 06151 16-01
Mo – Thu:
08:00 – 16:30 o'clock
Fr: 08:00 – 14:00 o'clock

Callers who do not know any number that is assigned to our college and university region, or who might be calling a number that is no longer in service, will automatically be redirected to HRZ central directory assistance.

The university and college region in Darmstadt include:

  • TU Darmstadt
  • Hochschule Darmstadt
  • Student services
  • Hessian State Museum Darmstadt
  • State archive and City archive
  • Federal institution for material testing Darmstadt .

The service is free of charge.