Sherman, J.
and Levine, J.
(2016),
Usage analysis of a national internet time service, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD
(Accessed September 9, 2025)
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Usage analysis of a national internet time service
Published
Author(s)
,
Abstract
The Internet Time Service (ITS) at the National Institute of Standards and Technology (NIST) currently receives over 12 billion time requests per day. ITS servers derive their system time from the NIST atomic-referenced timescale and distribute it freely to the public. Here we explore detailed ITS usage patterns discovered by analysis of inbound network traffic. For example, over a period of four weeks, just two of the approximately twenty ITS servers received requests from 316 million unique Internet Protocol (IPv4) addresses, which is at least 8.5% of the entire Internet. We offer recommendations for providers and consumers of network time services.Citation
Journal of Research (NIST JRES) -
NIST Pub Series
Pub Type
NIST Pubs
Keywords
internet time service, network time protocol (NTP), time transfer
Citation
Issues
If you have any questions about this publication or are having problems accessing it, please contact [email protected].
Created March 8, 2016, Updated November 14, 2018