Documentation

The NTP implementation documentation for all software versions from 1998 (NTP version 3.5.93e) to the present (NTP version 4.2.8p15) is available from the Documentation drop-down menu.

Most software versions represent a series of patch levels. The landing page for each series has a table showing all patch levels for that series, including release dates and links to release announcements. The documentation for a series applies to all patch levels for that series, unless specified otherwise.

To ensure your system is patched against all known vulnerabilities and has the latest features and bug fixes applied, it is recommended to use the latest series (4.2.8-series) and patch level (p15).

Additional Information

In addition to the implementation documentation, the following resources are available:

• Reference Library: Whitepapers, RFCs, and other technical documents written by Professor David L. Mills, inventor of NTP.
• NTP Wiki: Community contributed documentation.
• NTP FAQ: Frequently Asked Questions about the NTP protocol and software distribution.
• Public Time Server Lists: Provides an interface to browse or search for a public primary or secondary time server.
• comp.protocols.time.ntp: Google group. Includes postings from original Usenet newsgroup going back to June, 1990.