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 Area:
DNS: sth1.ntp.se
DNS: sth2.ntp.se
Malmo (Malmö) Area:
DNS: mmo1.ntp.se
DNS: mmo2.ntp.se
Sundsvall Area:
DNS: svl1.ntp.se
DNS: svl2.ntp.se
Gothenburg (Göteborg) Area:
DNS: gbg1.ntp.se
DNS: gbg2.ntp.se
Additionally, the DNS “ntp.se” can be used to automatically redirect a client to the nearest available service.
The Swedish Distributed Time Service is a completely free service with an open access policy.
The NTP Pool Project
The NTP pool project is a large virtual cluster of internet based network time servers. Pools of servers are located in many countries around the world. Clients can therefore synchronize to relatively local references, which reduces network latency and round-trip delays and provides a more robust source of time.
The pools are used by millions of systems around the world. Indeed, many standard Linux distributions and network appliances use the pool project servers as their default source of time.
The project is maintained and developed by a group of contributors. Servers are volunteered to the pool. Access to pool project servers is available over the internet to time clients free of charge.
Swedish NTP Pool Servers
The Swedesh pool zone is referenced by the following domain names:
0.se.pool.ntp.org
1.se.pool.ntp.org
2.se.pool.ntp.org
3.se.pool.ntp.org
Stratum 1 NTP Servers
DNS: time1.stupi.se
IP: 192.36.143.150
Location: Stupi AB, Stockholm.
NTP Version: NTP v3.
Time Source Information: Saphir Cesium Beam Standard \ GPS
Platform Information: BSDI Unix.
Service Area: SUnet, NORDUnet.
The service has an open access policy.
For further information, please contact Peter Lothberg at email address: roll@stupi.se
DNS: time2.stupi.se
IP: 192.36.143.151
Location: Stupi AB, Stockholm.
NTP Version: NTP v4
Time Source Information: Saphir Cesium Beam Standard \ GPS
Platform Information: FreeBSD.
Service Area: Europe
The service has an open access policy.
For further information, please contact Peter Lothberg at email address: roll@stupi.se
DNS: ntp1.sp.se
IP: 62.119.40.98
Location: Swedish National Testing and Research Institute.
NTP Version: NTP v4
Time Source Information: Swedish National Time Scale – UTC.
Platform Information: FreeBSD
Service Area: all areas
The service has an open access policy.
Contact Information: Kenneth Jaldehag at email address info@sp.se
DNS: ntp2.sp.se
IP: 62.119.40.99
Location: Swedish National Testing and Research Institute.
NTP Version: NTP v4
Time Source Information: Swedish National Time Scale – UTC.
Platform Information: FreeBSD
Service Area: all areas
The service has an open access policy.
For further information, please contact Kenneth Jaldehag at email address info@sp.se
Note: The public NTP servers listed on this page is not exhaustive and have not been tested by TimeTools. TimeTools cannot be held responsible for the availability or operation of the servers listed, we simply list a selection of links hoping that you may find them useful.
Time Zone and Daylight Saving Time Information
Sweden is part of the Central European Time Zone (CET), which is used in most central countries of Europe. CET is one hour ahead of Coordinated Universal Time (UTC). Daylight Saving Time comes into effect on the last Sunday in March at 02:00 (+1 hour UTC+2h) and ends on the last Sunday in October at 03:00 (-1 hour, UTC+1h).