For this reason, Google recommends that its public NTP servers are not used in conjunction with other non leap-smearing servers. However, leap smearing servers will provide a slightly different time to other servers during the insertion period. This prevents leap seconds from being potentially disruptive events. Leap smearing involves slowing clocks for a period of time before and after the actual leap second. This can cause problems with some software. Most Unix and Linux operating systems insert leap seconds by repeating the last second of the day. They have adopted leap-smearing technology to smoothly insert leap seconds over a period of time. However, Google have adopted a slightly different non-standard approach to leap second insertion. Google have recently revealed that they have implemented public NTP with load balancers and atomic clocks in their world-wide data centres. Regular changes are required so that clients can be distributed evenly between the available NTP servers, to prevent overloading. The domain names point to a random set of time servers in a particular zone that change every hour. Nl. (Netherlands – Nederland)Īgain, for each of these zones, you can specify a 0, 1 or 2 prefix if multiple server names are required. If you wish, you can specify continental zones in the domain name, as follows:Īlternatively, you can specify specific country zones: Including as of 2017, Europe at 2732, North America at 944, Asia at 243, Oceania at 109, making up a grand total of 4106 servers. You can also use the prefix 0, 1 or 2 to specify different pools of servers, if multiple server names are required:Īlmost every continent has a large number of clustered NTP time servers available. You can simply specify the domain name “” which will instruct the pool system to attempt to find the closest available server to your location. The NTP pool project is maintained by Ask Bjørn Hansen and a group of contributors. Many computer systems and network devices are configured by default to synchronize to their time servers.
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The project is a subscription free service that is used world-wide by thousands of clients. This allows clients to utilize a server that is relatively close, reducing round-trip delays and improving integrity. Pools of servers are located in most countries around the world. The time servers that make up the pools are volunteered and made public by individuals or enterprises that have servers on the internet. The project provides Internet access to very large virtual clusters of NTP servers.
The NTP pool project has been around for some time. The NTP Pool Project: Public Time Servers For Everyone Here we aim to provide an insight into available network time servers, configuring your client and synchronization best practices. There are a large number of public NTP time servers available across the Internet.
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