389 Directory Server

The enterprise-class Open Source LDAP server for Linux. It is hardened by real-world use, is full-featured, supports multi-master replication, and already handles many of the largest LDAP deployments in the world. The 389 Directory Server can be downloaded for free, and set up in less than an hour.


High performance LDAP server that can handle thousands of operations a second, and tens of thousands of concurrent users.


An open source, real-world, hardened stable directory service. As well as a rich feature set of fail-over and backup technologies.


With a database size that is only restricted by diskspace, high throughput performance, ease of expansion, and multimaster replication, the 389 Directory Server can meet the highest demands.

Welcome, new to the 389 Project?

If you’re new to the project you should start with our getting started page. It contains links to builds, source code and documentation. Our mission page also contains some good information about our goals and vision.

Key Features


To get in touch with us, you can try to reach us on IRC at #389 on irc.freenode.net or on one of our mailing lists.