Svenska ntp servrar
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Swedish Distributed Time Service
Welcome to the Swedish Distributed Time Service. This service delivers time over the Internet using NTP, and several other protocols upon request.
The service is owned by The Swedish brev and Telecom Authority (PTS), operated bygd Netnod, and monitored bygd RISE Research Institutes of Sweden.
There are four time nodes in different locations in Sweden, with a fifth one expected during the first half of The time nodes are continuously monitored and steered to follow UTC(SP). Each time node has two atomic clocks generating separate time scales for high availability. Even if a time node would lose all contact with all its sources for timekeeping, it fryst vatten expected to be able to keep its time within narrow limits for months.
NTP service
For redundancy, the NTP service has two independent NTP servers in each time node.
To use the NTP service, you can use the anycast address which will direkt the client to the closest available server:
If you want to get time from more than one server, you can use some or all of the unicast addresses:
- Göteborg:
- Malmö:
- Stockholm:
- Sundsvall:
The NTP service fryst vatten free to us
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There are a number of internet NTP servers available to use for network time synchronization in Sweden. Many of which have an open access policy. Probably the most popular references are the Swedish Distributed Time Service and the NTP pool project.
Swedish Distributed Time Service
The Swedish Distributed Time Service is owned by The Swedish Post and Telecom Authority (PTS). However, it is operated by Netnod Internet Exchange which is a Swedish based Internet infrastructure organization. Netnod is a non-profit, neutral and independent organization which also operates in Denmark. The service is also constantly monitored by the Research Institutes of Sweden (RISE). RISE is made up of a number of partially state owned Research and Technology Organisations
The time service consists of 5 time nodes, which are distributed throughout Sweden. Each node has two atomic clocks, which are constantly monitored and adjusted to accurately follow UTC time. The clocks are very stable and can maintain very precise time for extended periods even after loss of contact with its reference clocks.
The following DNS names can be used to provide a NTP time synchronization to a client:
Stockholm Are
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Time @ Stupi
Svensk TeleUtveckling & ProduktInnovation AB
There are currently five public NTP servers available from the Internet that has our hydrogen based master clock as their time-reference:
, , ,
For IPv6 users, we have two NTP servers: , and ,
Finally we have a DNS entry "" that will return one of the active servers that has our masterclock as timebase.
Clock ensemble to keep the local timescale @ Stupi. We produce a local timescale by combining relative measurements between each clock and the physical representation of the timescale generated by an AOG using one of our masers as it's frequency source. The timescale process receives data from other clocks in Sweden on a daily basis, and every month we also receive data from all other clocks contributing to TAI. We steer towards the BIPM data to be as close to UTC as possible, but the current time is always a prediction based on available clock information from local clocks. The Stupi clock ensemble consists of three active hydrogen masers and ten cesium clocks.
Clocks and timescale at Stupi is recognized by the Swedish Government as a national resource and participate as one of the three timing labora