Universität Bonn

University IT and Data Center

Time Server
The time server provides your computer with an exact time.

Time Server

The HRZ offers two time servers based on Network Time Protocol.

For whom?

Students & Employees

The service is available to all students and employees of the University of Bonn.

What for?

Exact time indication

    The time server allows the computer to be provided with an exact time to the second.

    How does it work?

    Two options
    The HRZ offers two time servers based on Network Time Protocol (NTP version 4, see http://www.ntp.org).
    The time servers can be accessed at clock1.hrz.uni-bonn.de and clock2.hrz.uni-bonn.de (port 123 tcp/udp) within the university network.

    The time servers are embedded Linux servers with clock modules that run as NTP servers with the stratum value 1. They obtain their time via DCF-77 signal from Mainflingen near Frankfurt am Main. By means of highly accurate corellation receivers, deviations from standard time between 0-2 µs are achieved.

    For the use of devices that have to be used temporarily outside the network of the University Bonn, we recommend the use of the
    time server pool pool.ntp.org.


    Detailed information and instructions can be found in the HRZ-Doku.
    (Only accessible through BONNET)

    Related Topics


    Understand how accurate time setting works.

    Administrator Tools

    Here you will find an overview of the administrator tools.

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