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Home | Services & Tools | Time Servers
last change: November 13, 2025

Time Servers

ACOnet operates two time servers that are available to the public for time queries via NTP. The two servers are located at different sites, and time synchronization is performed using different sources (GPS/Galileo and GPS).

The ACOnet time servers are accessible via the hostnames ts1.aco.net and ts2.aco.net. No administrative steps are necessary for this.

  • ts1.aco.net

    • Stratum 1
    • Location: Digital Realty, 1210 Vienna
    • Time Source: GPS/Galileo
    • Protocols: NTP, PTP (internal)

  • ts2.aco.net

    • Stratum 1
    • Location: University of Vienna / NIG, 1010 Vienna
    • Time Source: GPS
    • Protocol: NTP

Both servers are also available as pool servers for those who prefer to use the NTP Pool Service instead of specifying explicit server entries. The server ts1.aco.net is also capable of functioning as a PTP Grandmaster.

If you have any questions about the ACOnet time servers, please get in touch with domain-admin(at)univie.ac.at.

ACOnet participants can configure those servers as "peers" if the participant runs his stratum 1 time server with a proper reference clock. In this case, please send requests to domain-admin(at)univie.ac.at.