Free time services

We deliver Swedish Distributed Time. 
Keeping Sweden in sync.

Netnod’s NTP service, funded by the PTS, is available for free to anyone. It uses a distributed timescale on multiple, autonomous sites throughout Sweden to provide a time service available over IPv4 or IPv6. The time is traceable to the official Swedish time UTC(SP). Each site has full redundancy: multiple servers, caesium clocks, and FPGA boards providing an extremely fast hardware implementation of NTP.

• 5 distributed nodes at Internet exchange points in: Stockholm, Malmo-Copenhagen, Gothenburg, Sundsvall and Lulea
• Stratum-1 time servers
• Local time scales traceable to UTC (SP)
• External monitoring for independent quality and performance assessment
• High-performance NTP servers with anycast addresses to mitigate Denial of Service (DoS) attacks and to simplify user configurations

Should we be using NTP or NTS?

Should we be using NTP or NTS?
NTP is vulnerable to Man-in-the-Middle (MITM) attacks. This is where a malicious actor sits between you and the NTP server,  listens in on the conversation, forges messages and lies to you about time.
With many of today’s most important security processes dependent on accurate time, the consequences of receiving time from a malicious source are serious. Everything from establishing encrypted TLS sessions and using DNSSEC to time-stamping financial transactions and preventing online fraud depends on accurate and secure time. By using NTS, you can be sure your devices are receiving accurate time from a reliable source.