NTP: The Network Time Protocol

Welcome to ntp.org, home of the Network Time Protocol project.

This page is home for the NTP Project (R&D). This web site, and all pages directly contained within, are in the public domain. Some portions of this site may be copyrighted by other authors. Please contact the webmaster with any questions regarding copyright. The NTP software distribution is copyrighted, as described in the NTP copyright page.

The NTP Project (R&D)

The NTP Project conducts Research and Development in NTP and produces the Official Reference Implementation of NTP along with the Implementation Documentation. Background information about NTP, along with briefings and a bibliography, are available at the Network Time Synchronization Project Page.

The NTP Public Services Project

The NTP Public Services Project, which is hosted by Internet Systems Consortium, Inc., provides support and additional development resources for the Official Reference Implementation of NTP. The available resources include:

• Community Supported Documentation
• Issue / Bug Reporting
• Mailing Lists
• Public Time Server Lists
• Reference Implementation Downloads
• Server Pool Project

NTP is a protocol designed to synchronize the clocks of computers over a network. NTP version 3 is an internet draft standard, formalized in RFC 1305. NTP version 4 is a significant revision of the NTP standard, and is the current development version, but has not been formalized in an RFC. Simple NTP (SNTP) version 4 is described in RFC 2030.

Please direct comments and questions about this web site to the NTP Project webmaster. To contact the NTP Public Services Project web maintainers or any member of the NTP developer team, please see the Public Services Project Contact Page.