Network Time Protocol

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Related to NTP server: Time server

Network Time Protocol

(NTP) A protocol built on top of TCP/IP that assures accurate local timekeeping with reference to radio, atomic or other clocks located on the Internet. This protocol is capable of synchronizing distributed clocks within milliseconds over long time periods. It is defined in STD 12, RFC 1119.
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(Network Time Protocol) A TCP/IP protocol used to synchronize the real-time clock in computers, network devices and other electronic equipment. NTP is also used to maintain the correct time in Internet-connected wall and desk clocks.

The Coordinated Universal Time (UTC) can be obtained over the Internet from NTP time servers, or it can be acquired from stand-alone devices that receive atomic clock signals from the GPS. For more information, visit See UTC and time server.

Get the Time
Every time this Snom IP phone boots up, it gets the time from an NTP server.

Keep In Sync
SymmTime for Windows synchronizes a computer's real-time clock from NTP servers. It can display multiple time zones in digital and analog formats.

Out of Sync
This earlier LMCheck utility showed the time from all machines in the network. Computer clock circuits cost only a few cents and tend to drift (as in this example), which is why a network time server keeps every machine synchronized.

Synchronization Plus Security
For greater security, time servers such as this earlier SyncServer from Symmetricom obtained the time from the GPS rather than the Internet. (Image courtesy of Microsemi Corporation,
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Skoog presents eight security features that modern NTP servers should include (Skoog, 2017):
The NTP measurement system requests the time from each NTP server being monitored every 10 s.
Unlike NTP Servers which are managed by professionals, these devices are managed by individual users and can thus be difficult to protect.
In addition, as a fifth method, HUMENA used GPS Satellites, NIST Atomic Clock and NTP Servers Worldwide to synchronize those methods in Group [Interpersonal Group Synchronization] with the highest resolution possible - a milliseconds range.
There are over 100,000 abusable NTP servers with administrative functions incorrectly open to the general Internet.