Last site update: 10 July 2015 | Latest PTPd version: 2.3.1 | PTPd is hosted by Logo


The PTP daemon (PTPd) implements the Precision Time protocol (PTP) as defined by the relevant IEEE 1588 standard. PTP Version 2 implements IEEE-1588-2008. PTP was developed to provide very precise time coordination of LAN connected computers.

Documentation is now being added to the project Wiki .

PTPd is a complete implementation of the IEEE 1588 specification for a standard (non-boundary) clock. PTPd has been tested with and is known to work properly with other IEEE 1588 implementations. The source code for PTPd is freely available under a BSD-style license. Thanks to contributions from users, PTPd is becoming an increasingly portable, interoperable, and stable IEEE 1588 implementation.

PTPd can run on most 32-bit or 64-bit, little- or big-endian processors. It does not require an FPU, so it is great for embedded processors. PTPd currently runs on Linux, uClinux, FreeBSD, and NetBSD. It should also be easy to port to other platforms.

PTPd is free. Everyone is welcome to use and contribute to PTPd.

The PTPd project would like to thank the following for their kind donations of equipment and time:

Meinberg Corp
Donation of an m600 PTPv2 GPS Grandmaster Clock
Sentex Data Communications
Hosting the FreeBSD Network Test Cluster
The FreeBSD Foundation
Providing testing resources for the PTPd Project
Juniper Networks
Donation of a TCA8000 series PTPv2 GPS Grandmaster Clock
Solarflare Communications, Inc.
Donation of a pair of SFN6322F PTP-enabled 10GE network cards

PTPd version 1 implements IEEE-1588-2002 and is considered a legacy protocol. PTPd 1.x is not recommended for general use anymore - source is available for version 1.1.0