Public NTP Service

This service is going to cease in the near future. Please change your settings, if you are using this service.

Japanese version

Topics

  • Temporary suspension of 133.100.9.2 service
    Due to maintenance, the NTP service of 133.100.9.2 will be unavailable for the following period. The service outage time may vary slightly.
    Service interruption time: Wednesday, August 5, 2020, 1:00 pm to 6:00 pm (JST).   (Published: August 3, 2020)
  • Temporary suspension of 133.100.9.2 service
    Due to maintenance, the NTP service of 133.100.9.2 will be unavailable for the following period. The service outage time may vary slightly.
    Service interruption time: Monday, August 3, 2020, 1:00 pm to 6:00 pm (JST).   (Published: August 2, 2020)
  • Temporary suspension of 133.100.9.2 service
    Due to maintenance, the NTP service of 133.100.9.2 will be unavailable for the following period. The service outage time may vary slightly.
    Service interruption time: Saturday, July 18, 2020, 9:00 pm (JST) to Sunday, July 19, 2020, Until 2:00 am (JST).   (Published: June 30, 2020)
  • Official Twitter
    Public NTP Service Official Twitter has released. (Published: June 26, 2019)
  • Temporary suspension of 133.100.9.2 service
    The NTP service of 133.100.9.2 experimentally suspends. The suspension period is scheduled to be 5:00 PM from 9:00 AM on June 30, 2019. (Published: June 11, 2019)
  • Cease NTP service of 133.100.11.8
    The NTP service of 133.100.11.8 doesn’t respond to any request packets, because the NTP service has ended. There is no plan to resume the service. (Published: March 12, 2019)
  • Removed DNS records
    Forward and reverse DNS lookups for 133.100.9.2 and 133.100.11.8 has removed. (Published: March 12, 2019)
  • Resume service of 133.100.11.8
    The NTP service of 133.100.11.8 was resumed. (Published: March 1, 2019)
  • Temporary suspension of 133.100.11.8 service
    The NTP service of 133.100.11.8 experimentally suspends. The suspension period is scheduled to be February 28 from 9:30 AM on February 6, 2019. The NTP service of 133.100.9.2 doesn’t stop. (Published: Feb 5, 2019)
  • Erased Public Time Server Lists from www.ntp.org
    The NTP servers were deleted from “Public Time Server Lists (Public NTP Primary (stratum 1) Time Servers)” of www.ntp.org. (Published: Aug. 9, 2018)

About Public NTP Service

Since October 1993, Fukuoka University has provided public NTP service (time synchronization service) using GPS to the world. There is the IPv4 address providing NTP service as follows.

  • 133.100.9.2
  • 133.100.11.8 (ceased providing the service on March 12, 2019)

However, in recent years traffic of this service has been increasing, and as of September 2019, approximately 250Mbps which is the average daily bandwidth and approximately 332,000pps (packets per second) are constantly receiving. As it is, there is a danger that it will have a serious impact on the stable operation of the campus network, so we are currently implementing bandwidth limitations. We appreciate your understanding and cooperation.

In addition, the traffic is still increasing little by little, so it is difficult to stably operate the campus network, so we have decided to “cease this service in the future”. We will conduct various experiments in the future and prepare for the service stop while consulting with network operators. When the stop the date is decided, we will publicize.

Related links

 

 The following links are Japanese only.

  • Journal of The Institute of Electronics, Information and Communication Engineers(May 2019, Vol.102, No.5)
    IoT_and_Public_NTP_Service